| 03/12/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | A V Lawson |
| |
| 19/11/15 | Mediterranean Gull | Main Pit, Theale GPs | 1 | K E Moore |
15:30
| ad w/p. same bird as on Hosehill 15 Nov. |
| 15/11/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | T G Ball |
14:40
| ad. Seen with KEM, it arrived while we were checking for Black-headed Gull colour rings. |
| 03/10/15 | Mediterranean Gull | Lavell's Lake, Dinton Pastures CP | 1 | M F Walford |
14:10
| ad. Circling over carpark. |
| 29/09/15 | Mediterranean Gull | Lower Farm GP | 1 | M J Dear |
| 1w. spotted by nc. |
| 27/09/15 | Mediterranean Gull | Lower Farm GP | 1 | N Cleere |
| juvenile moulting into 1w plumage. This bird has now been present on and off for several weeks. |
| 01/09/15 | Mediterranean Gull | Lower Farm GP | 1 | N Cleere |
| juvenile in advanced moult into 1st winter plumage. |
| 22/07/15 | Mediterranean Gull | Queen Mother Reservoir | 1 | K E Moore |
13:30
| juv. found by RHS at apprx 1230 hrs. Key holders only. |
| 22/07/15 | Mediterranean Gull | Sandford Lake, Dinton Pastures CP | 1 | R Marsh |
12:10
| juv. Still present on island. |
| 22/07/15 | Mediterranean Gull | Sandford Lake, Dinton Pastures CP | 1 | F J Cottington |
10:45
| juv. Still present on old tern island. |
| 22/07/15 | Mediterranean Gull | Sandford Lake, Dinton Pastures CP | 1 | M F Walford |
07:38
| juv. |
| 18/07/15 | Mediterranean Gull | Lower Farm GP | 1 | N Cleere |
| adult S/P. |
| 12/07/15 | Mediterranean Gull | Lower Farm GP | 1 | N Cleere |
| adult s/p. |
| 05/06/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 6 | A B Tomczynski |
14:30
| 2 adults, 4 1st summer. Five at first, then all mobile, photographs show 6 different birds though. All flew due west 14:37hrs. |
| 05/06/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 8 | A V Lawson |
11:51
| |
| 20/04/15 | Mediterranean Gull | Moor Green Lakes | 1 | R F Milligan |
09:10
| Ad S, displaying to the BHG, without any luck. Different bird than the last one a week or so ago. |
| 19/04/15 | Mediterranean Gull | Moor Green Lakes | 1 | R Murfitt |
11:00
| ad. On Tern Island bullying BHG's. |
| 18/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | A V Lawson |
08:15
| |
| 15/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | L Garner-Langham |
| |
| 16/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | A B Tomczynski |
09:00
| Summer plumage adult, metal ring left leg. |
| 09/04/15 | Mediterranean Gull | Moor Green Lakes | 1 | R Murfitt |
13:40
| On Tern island. |
| 08/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | R Crawford |
06:15
| Second-summer on the island. |
| 07/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | C McEwan |
16:00
| At right hand end of the main island. |
| 06/04/15 | Mediterranean Gull | Moor Green Lakes | 1 | J B Sheridan |
16:30
| On island on CLN with BHGs. |
| 06/04/15 | Mediterranean Gull | Moor Green Lakes | 1 | R F Milligan |
09:25
| 2nd S, displaying to the BH Gulls, Tern Island, CLN. |
| 06/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 2 | L Seward |
| |
| 06/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | T G Ball |
10:40
| 2s. Sitting on island amidst the BH Gulls. |
| 05/04/15 | Mediterranean Gull | Moor Green Lakes | 1 | R Murfitt |
09:30
| 2s. On Tern island displaying to BHGs (seen with Noel Silver, Martin Seward). |
| 05/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 2 | N Cleere |
07:45
| ad & 2s. |
| 05/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | R Crawford |
08:30
| 2nd summer, on the island. |
| 04/04/15 | Mediterranean Gull | Colebrook Lake, Moor Green Lakes | 1 | K P Duncan |
| 2s. |
| 03/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | R Crawford |
08:00
| 2s. On the island. |
| 02/04/15 | Mediterranean Gull | Theale GPs | 2 | A B Tomczynski |
18:35
| Two sum plum adults on water M4 side. |
| 02/04/15 | Mediterranean Gull | Hosehill Lake, Theale GPs | 1 | A B Tomczynski |
17:30
| Second summer on island at present. |
| 02/04/15 | Mediterranean Gull | Main Pit, Theale GPs | 1 | A V Lawson |
12:00
| |
| 20/01/15 | Mediterranean Gull | Queen Mother Reservoir | 1 | P J Newbound |
| 1w. Key holders only. |
| 11/01/15 | Mediterranean Gull | Dorney Wetlands, Jubilee River | 1 | D A Carter |
| ad. Found by R.Ness. On water for 10min before flying west into bucks. |