| 15/09/20 | Willow Warbler | Muswell Hill nr Piddington | 2 | C W Oram |
16:30
| |
| 15/09/20 | Willow Warbler | Piddington Wood | 2 | C W Oram |
08:20
| |
| 14/09/20 | Willow Warbler | Muswell Hill nr Piddington | 6 | C W Oram |
16:30
| Minimum. |
| 12/09/20 | Willow Warbler | East Challow | 1 | M Merritt |
| |
| 11/09/20 | Willow Warbler | Letcombe Regis | 2 | M Merritt |
| |
| 10/09/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 1 | L Marriner |
18:43
| With tit flock. |
| 10/09/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 1 | L Marriner |
18:43
| With tit flock. |
| 31/08/20 | Willow Warbler | Waterstock: River Thame | 1 | N Marriner |
07:30
| |
| 30/08/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 2 | N Marriner |
07:30
| |
| 31/08/20 | Willow Warbler | Aston Upthorpe | 4 | J Taylor |
16:55
| Family group feeding in hawthorn at foot of Juniper Valley. |
| 29/08/20 | Willow Warbler | Baulking Pit | 2 | M Merritt |
| SU322909. |
| 28/08/20 | Willow Warbler | Baulking Pit | 1 | M Merritt |
| SU322909. |
| 28/08/20 | Willow Warbler | Headington: Warneford Hospital | 10 | I West |
07:45
| |
| 26/08/20 | Willow Warbler | Muswell Hill nr Piddington | 1 | C W Oram |
10:00
| |
| 24/08/20 | Willow Warbler | Lockinge | 2 | L Bateman |
15:33
| SU428876. |
| 24/08/20 | Willow Warbler | Wytham: Field Station | 5 | K McMahon |
13:02
| Trapped and ringed at Wytham fieldstation. SP471096. |
| 23/08/20 | Willow Warbler | Muswell Hill nr Piddington | 3 | N Truby |
09:30
| |
| 23/08/20 | Willow Warbler | Chipping Norton | 1 | S B Akers |
10:45
| SP283284. |
| 22/08/20 | Willow Warbler | Letcombe Bassett: Gramps Hill | 3 | M Merritt |
| |
| 20/08/20 | Willow Warbler | Muswell Hill nr Piddington | 1 | N Truby |
14:13
| |
| 17/08/20 | Willow Warbler | Cassington GPs | 1 | J Coppock |
20:39
| |
| 16/08/20 | Willow Warbler | Baulking Pit | 1 | M Merritt |
| SU322908. |
| 16/08/20 | Willow Warbler | Letcombe Bassett: Gramps Hill | 8 | M Merritt |
| |
| 16/08/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 2 | N Marriner |
19:00
| |
| 15/08/20 | Willow Warbler | Waterstock | 2 | N Marriner |
08:00
| |
| 15/08/20 | Willow Warbler | Waylands Smithy | 3 | M Merritt |
| |
| 15/08/20 | Willow Warbler | East Challow | 2 | M Merritt |
| |
| 12/08/20 | Willow Warbler | Aston Rowant: Aston Rowant NNR | 3 | J Newcombe |
08:30
| |
| 06/08/20 | Willow Warbler | East Challow | 2 | M Merritt |
| |
| 07/08/20 | Willow Warbler | Harwell Laboratory | 2 | M Merritt |
| |
| 08/08/20 | Willow Warbler | Letcombe Regis | 1 | M Merritt |
| |
| 04/08/20 | Willow Warbler | Chipping Norton | 1 | S B Akers |
09:00
| SP283268. |
| 01/08/20 | Willow Warbler | Devil's Punchbowl | 1 | L Bateman |
13:00
| juv. Sparsholt Firs car park. |
| 31/07/20 | Willow Warbler | Chipping Norton | 1 | S B Akers |
07:30
| SP283268. |
| 31/07/20 | Willow Warbler | Chipping Norton | 1 | S B Akers |
18:00
| SP283268. |
| 31/07/20 | Willow Warbler | Chipping Norton | 1 | S B Akers |
07:30
| SP283268. |
| 29/07/20 | Willow Warbler | Water Eaton | 4 | J Dexter |
07:37
| juv. First signs of passage with 4 juveniles moving south along the hedgerows. |
| 26/07/20 | Willow Warbler | East Challow | 1 | M Merritt |
| |
| 17/07/20 | Willow Warbler | Baulking | 7 | M Merritt |
| inc. fresh juvs. |
| 13/07/20 | Willow Warbler | Baulking Pit | 8 | M Merritt |
| SU322909. |
| 15/06/20 | Willow Warbler | Compton Downs | 2 | J Taylor |
16:31
| m. |
| 11/06/20 | Willow Warbler | Otmoor | 5 | I West |
17:00
| |
| 10/06/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 2 | L Marriner |
16:49
| |
| 03/06/20 | Willow Warbler | Chipping Norton | 1 | S B Akers |
09:30
| SP297276. |
| 29/05/20 | Willow Warbler | Otmoor | 4 | I West |
06:15
| |
| 28/05/20 | Willow Warbler | Freeland | 2 | D L Cleal |
15:40
| Singing in the conservation area on eastside of the Bluebell Wood south of the village. |
| 28/05/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
04:31
| |
| 28/05/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
04:31
| |
| 25/05/20 | Willow Warbler | Baulking Pit | 10 | M Merritt |
| SU322908. |
| 26/05/20 | Willow Warbler | Otmoor | 2 | I West |
11:00
| |
| 20/05/20 | Willow Warbler | River Thames, Cholsey Marsh, north | 1 | M Amphlett |
06:45
| Male singing from a large willow tree nr Bow bridge. SU6086. |
| 21/05/20 | Willow Warbler | Chimney: Chimney Meadows | 3 | M Merritt |
| |
| 18/05/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | N Marriner |
07:00
| |
| 17/05/20 | Willow Warbler | Cothill: Hitchcopse Pit | 1 | M Merritt |
| m. |
| 14/05/20 | Willow Warbler | Enslow | 3 | D Watkinson |
17:00
| 3 singing along the canal between Hampton Gay and Kirtlington. SP483176. |
| 12/05/20 | Willow Warbler | Baulking Pit | 10 | M Merritt |
| SU322909. |
| 11/05/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 5 | N Marriner |
07:15
| |
| 10/05/20 | Willow Warbler | Kidlington: Kidlington Church | 1 | D Watkinson |
09:30
| Singing male. SP478179. |
| 10/05/20 | Willow Warbler | Baulking Pit | 9 | M Merritt |
| singing male. SU322908. |
| 07/05/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | N Marriner |
07:15
| |
| 07/05/20 | Willow Warbler | A329 nth of Cholsey | 1 | M Amphlett |
15:00
| Male singing from woodland edge nr Bow bridge. SU6086. |
| 07/05/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
21:33
| |
| 06/05/20 | Willow Warbler | A329 nth of Cholsey | 1 | M Amphlett |
19:30
| Male calling from willows adjacent Bow bridge. SU6086. |
| 06/05/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
20:43
| |
| 05/05/20 | Willow Warbler | Henley Road GPs | 1 | R C Watts |
15:50
| On daily exercise walk. |
| 04/05/20 | Willow Warbler | Woodeaton: Woodeaton Wood | 1 | N Boyd |
08:00
 | Probably pure willow warbler doing fast chiffchaff song often "turning into" willow warbler at the end. Can share recordings. Plumage brightness, primary projection and bare parts all match willow warbler; hybrids are apparently rare and willow warbler are known to mimic chiffchaff sometimes. Same bird in same place previous week also. SP540110. |
| 02/05/20 | Willow Warbler | A329 nth of Cholsey | 1 | M Amphlett |
17:50
| Male singing from woodland nr Bow Bridge. FoY. SU6086. |
| 03/05/20 | Willow Warbler | Otmoor | 1 | S Myers |
17:44
| |
| 29/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
15:47
| |
| 28/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
22:01
| |
| 27/04/20 | Willow Warbler | Stratfield Brake | 1 | S Myers |
19:30
| |
| 27/04/20 | Willow Warbler | Water Eaton | 1 | J Dexter |
10:15
| Near to the railway bridge. |
| 26/04/20 | Willow Warbler | Tadpole Bridge To Shifford Lock | 2 | R Parsons |
19:26
| SP356003. |
| 23/04/20 | Willow Warbler | South Leigh | 2 | R W Catling |
19:30
| |
| 23/04/20 | Willow Warbler | Stratfield Brake | 2 | J Dexter |
09:00
| |
| 22/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 6 | L Marriner |
18:55
| |
| 21/04/20 | Willow Warbler | West Ginge: West Ginge Down | 1 | M Merritt |
| |
| 20/04/20 | Willow Warbler | Thame | 3 | N Marriner |
07:15
| SP709070. |
| 19/04/20 | Willow Warbler | Sarsgrove | 4 | S B Akers |
11:00
| |
| 18/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
10:19
| |
| 16/04/20 | Willow Warbler | Thame: Cuttle Brook | 2 | N Marriner |
07:00
| |
| 16/04/20 | Willow Warbler | Baulking Pit | 8 | M Merritt |
18:29
| Singing males. SU322908. |
| 15/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 2 | L Marriner |
19:22
| |
| 15/04/20 | Willow Warbler | Chipping Norton: Glyme Farm | 1 | S B Akers |
11:26
| male. Singing male. |
| 14/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 6 | L Marriner |
09:32
| |
| 13/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
18:40
| |
| 12/04/20 | Willow Warbler | Fyfield Wick | 1 | P Pool |
12:50
| First of the year heard singing here. SU412970. |
| 10/04/20 | Willow Warbler | Towersey - Pheonix Trail | 1 | N Marriner |
07:30
| SP737048. |
| 09/04/20 | Willow Warbler | Towersey - Pheonix Trail | 2 | N Marriner |
07:30
| SP737048. |
| 12/04/20 | Willow Warbler | Northmoor | 3 | M Cunningham |
19:29
| SP408022. |
| 11/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 2 | L Marriner |
21:12
| |
| 10/04/20 | Willow Warbler | New Marston: New Marston Meadows | 1 | T Evans |
| FOY. |
| 10/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 1 | L Marriner |
17:58
| |
| 09/04/20 | Willow Warbler | Joe White's Lane, Wolvercote | 1 | S Goddard |
19:30
| SP490102. |
| 09/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
18:42
| |
| 08/04/20 | Willow Warbler | Chinnor | 1 | D Stracey |
10:00
| 1 along The Ridgeway. SU753994. |
| 07/04/20 | Willow Warbler | Bletchingdon | 1 | D Watkinson |
19:00
| Singing. SP504176. |
| 07/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 2 | L Marriner |
18:49
| |
| 07/04/20 | Willow Warbler | River Thames: Iffley to Sandford | 1 | A Cheke |
16:51
| Singing near Sandford Lock. |
| 07/04/20 | Willow Warbler | West Challow | 2 | M Merritt |
| SU364883. |
| 06/04/20 | Willow Warbler | Sarsgrove | 2 | S B Akers |
11:30
| |
| 06/04/20 | Willow Warbler | East Challow | 3 | M Merritt |
| |
| 06/04/20 | Willow Warbler | Didcot Moor Ditch | 1 | W Lester |
10:15
| SU522914. |
| 06/04/20 | Willow Warbler | Farmoor village | 1 | P Butler |
10:15
| SP450070. |
| 06/04/20 | Willow Warbler | Moreton nr Thame: Moreton Golf Course | 4 | L Marriner |
08:44
| |
| 05/04/20 | Willow Warbler | Sarsgrove | 2 | S B Akers |
12:00
| First here this year. |
| 05/04/20 | Willow Warbler | Hornton | 1 | M Prentice |
14:34
| SP381455. |
| 05/04/20 | Willow Warbler | East Challow | 2 | M Merritt |
| |
| 05/04/20 | Willow Warbler | Baulking Pit | 2 | M Merritt |
| SU322908. |
| 05/04/20 | Willow Warbler | Waterstock: River Thame | 1 | L Marriner |
09:55
| |
| 05/04/20 | Willow Warbler | Port Meadow: Burgess Field Nature Park | 1 | A Hartley |
| m. singing. |
| 05/04/20 | Willow Warbler | Carterton | 2 | G Best |
07:48
| SP284084. |
| 04/04/20 | Willow Warbler | Appleford: Appleford GP | 1 | C MacKenzie |
20:03
| Singing along Thames. SU520942. |
| 04/04/20 | Willow Warbler | East Challow | 1 | M Merritt |
| |
| 04/04/20 | Willow Warbler | Radley GP | 2 | I Elkins |
| Singing. FOY. |
| 04/04/20 | Willow Warbler | River Thames: nr Sandford-on-Thames | 1 | D Moden |
10:29
| |
| 03/04/20 | Willow Warbler | Bicester Wetland Reserve | 1 | L Bryant |
10:15
| Singing. |
| 26/03/20 | Willow Warbler | Baulking Pit | 1 | M Merritt |
| m. Subsong. SU322908. |
| 19/03/20 | Willow Warbler | Baulking Pit | 1 | M Merritt |
| SU322909. |