| 17/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
11:24
| |
| 15/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
07:47
| |
| 14/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | N Rampton |
18:22
| Still present. |
| 12/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R Crawford |
09:30
| |
| 09/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
10:30
| |
| 08/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R Crawford |
06:05
| |
| 07/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | C McEwan |
16:00
| Swimming near buoy 12
. |
| 06/04/15 | Great Northern Diver | Theale GPs | 1 | L Seward |
| |
| 05/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R C Watts |
12:45
| With. B May birds near orange buoy and number 6 yellow Buoy. |
| 05/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
11:47
| Still present. |
| 03/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R Crawford |
08:20
| |
| 02/04/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
10:29
| |
| 31/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
11:16
| |
| 29/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
19:10
| |
| 29/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R J Burness |
09:30
| juv. At the eastern end. |
| 28/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
09:44
| |
| 26/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | M Terry |
12:35
| Finally! About the 10th time of asking y/t. |
| 26/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
11:58
| |
| 25/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
10:30
| |
| 20/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
15:59
| |
| 18/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
09:40
| |
| 17/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
11:23
| |
| 15/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | M F Walford |
12:00
| at the motorway end. |
| 14/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | S A Graham |
13:40
| Motorway end. |
| 12/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
11:02
| Still present
Still eating crayfish
Sitting very low in the water. |
| 11/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
09:11
| Eating Crayfish. |
| 10/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | T G Ball |
15:20
| Still present but distant. |
| 10/03/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
11:14
| |
| 25/02/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | J C Morgan |
11:00
| |
| 21/02/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | J E Andrews |
14:30
| in between island and ski club. |
| 20/02/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
17:23
| Flew in at 17 20 and started preening. |
| 20/02/15 | Great Northern Diver | Moatlands Main Lake, Theale GPs | 1 | R H Stansfield |
15:00
| Still present close to motorway side of lake. Frequently diving. |
| 15/02/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | J E Andrews |
10:00
| by ski ramp
with R.P and all on T.A.B.C.G walk. |
| 08/02/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | J E Andrews |
10:00
| ski club. |
| 07/02/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | J E Andrews |
15:00
| in front of ski club. |
| 07/02/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | R J Burness |
10:00
| juv. Just off the water ski club jetty. |
| 06/02/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | J C Morgan |
12:00
| |
| 05/02/15 | Great Northern Diver | Moatlands Main Lake, Theale GPs | 1 | R H Stansfield |
14:50
| Again showing well in front of ski club. |
| 25/01/15 | Great Northern Diver | Moatlands Main Lake, Theale GPs | 1 | C McEwan |
11:00
| Between the island and the eastern end of the pit. |
| 25/01/15 | Great Northern Diver | Moatlands Main Lake, Theale GPs | 1 | G Sumner |
11:44
| Close to Ski Club. |
| 25/01/15 | Great Northern Diver | Moatlands Car Park Pit, Theale GPs | 1 | R Addison |
09:20
| Showing very well from the sailing club jetty. |
| 24/01/15 | Great Northern Diver | Moatlands Main Lake, Theale GPs | 1 | J E Andrews |
13:30
| viewed from car park, highly mobile. |
| 24/01/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | T A Guyatt |
10:00
| imm. Seen near M4 bank. Caught large, red-finned fish and preened for 10mins. SU6670. |
| 23/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R C Watts |
09:20
| Right hand side of Island near buoy no 2 yellow ,lake frozen in parts so all birds are in open water together seen with. A .A. |
| 21/01/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | P Driver |
10:35
| First bird on the water walking from car park. mid-way towards the island but v mobile. |
| 20/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R Gilham |
13:50
| M4 end, between island and pink buoy 9. |
| 18/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
16:24
| |
| 18/01/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | J E Andrews |
10:00
| in front of boat club, showing very well and close at times. |
| 17/01/15 | Great Northern Diver | Moatlands GP, Theale GPs | 1 | S A Graham |
14:05
| Directly opposite entrance to Water Ski center bathing and preening, but not present 30 minute later on my return. |
| 16/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
11:30
| |
| 10/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R H Stansfield |
16:00
| Still present. |
| 08/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | K E Moore |
15:45
| 1w. seen with RCWD , far to the East. |
| 08/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R J Burness |
11:00
| Trawling along the eastern end. |
| 07/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | P E Hutchins |
12:22
| On viewing from the sailing the bird was directly 'east', spending time in front of the large orange buoy. |
| 07/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
15:35
| Flew in and began fishing straight away. |
| 06/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A B Tomczynski |
15:42
| SU660706. |
| 05/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R H Stansfield |
15:40
| 1w. Still here at this time. |
| 03/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | R Collins |
08:02
| In front of Oystercatcher Island. Possible group of Brent Geese flew off East, but light too poor. Too small for Canadas. |
| 02/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | A V Lawson |
16:30
| Good views in the moonlight preening 200 yards from the spit. |
| 02/01/15 | Great Northern Diver | Main Pit, Theale GPs | 1 | K E Moore |
15:15
| 1w. seen only briefly , but well.Close in to S.edge , just beyond warbler pylon.
Seen with SRi. |