| 2024 | Theale GPs, nine, 14th October (A. B. Merrick). |
| 2024 | Queen Mother Reservoir, ten, 16th September (A. B. Tomczynski). |
| 2024 | Theale GPs, three, 15th September to 30th October (A. B. Merrick). |
| 2024 | Lower Farm GP, 8th September (A. B. Tomczynski). |
| 2024 | Pangbourne, 1st-10th August (D. B. Marsh). |
| 2024 | Dorney Wetlands, two, adult, 18th June (C. D. R. Heard). |
| 2024 | Caversham, 13th June (C. J. Forsey). |
| 2024 | Pangbourne, 8th-9th June (M. Winkworth). |
| 2024 | Halfway, six, 29th April (I. L. G. Weston). |
| 2024 | Lower Farm GP, eight, 4th April to 14th August (I. L. G. Weston). |
| 2024 | Padworth Lane floods, three, 25th March (J. Margetts). |
| 2024 | Chamberhouse Marsh, five, 18th March to 13th July (N. Cleere). |
| 2024 | Holyport, 10th February (D. J. Barker). |
| 2024 | Colnbrook, 8th February (C. D. R. Heard). |
| 2023 | Fleethill Farm, 24th September (J. C. Morgan). |
| 2023 | Lea Farm Lake, adult, 16th September (J. E. Warren). |
| 2023 | Theale GPs, 26th August (A. B. Merrick). |
| 2023 | Cock Marsh, 16, 11th August (A. D. Bassett). |
| 2023 | Dinton Pastures CP, 11th August (R. Dawson, T. James). |
| 2023 | Lower Farm GP, 18, 17 adult, juvenile, 10th-11th August (N. Cleere). |
| 2023 | Theale GPs, adult, 18th July (K. E. Moore). |
| 2023 | Theale GPs, 3rd April (A. B. Merrick). |
| 2023 | Thatcham, 23rd-26th March (D. J. Reynolds). |
| 2023 | Chapel Green, 26th January to 8th February (E. Napper). |
| 2022 | Sonning, two, 21st August (A. B. Tomczynski). |
| 2022 | Wraysbury GPs, 13th-14th August (C. D. R. Heard). |
| 2022 | Padworth Lane GP, two, adult, 24th May to 17th September (K. E. Moore). |
| 2022 | Theale GPs, four, adult, 1st May to 1st November (A. B. Merrick). |
| 2022 | Lea Farm Lake, two, 27th April (S. Robertson). |
| 2022 | Lower Farm GP, three, 11th April (A. B. Tomczynski). |
| 2022 | Chamberhouse Marsh, four, adult, 10th-14th April (M. J. Dear, J. Legg, I. L. G. Weston). |
| 2022 | Twyford GPs, 30th March (A. B. Tomczynski). |
| 2022 | Lea Farm Lake, 29th March (N. Kightley). |
| 2022 | Holyport, 1st March (D. J. Barker). |
| 2021 | Sonning Farm, five, 3rd-19th November (A. B. Tomczynski). |
| 2021 | Queen Mother Reservoir, five, adult, 16th October (C. D. R. Heard). |
| 2021 | Lea Farm Lake, 16th October (F. J. Cottington). |
| 2021 | Sheffield Bottom, adult, 10th-12th April, same as Theale GPs (R. H. Stansfield). |
| 2021 | Theale GPs, four, 6th-25th April (K. P. Duncan). |
| 2020 | Queen Mother Reservoir, two, 29th September (C. D. R. Heard). |
| 2020 | Lower Farm GP, adult, 25th September to 23rd December (N. Cleere, I. L. G. Weston). |
| 2020 | Theale GPs, adult, 21st September (R. H. Stansfield). |
| 2020 | Charvil, 11th-12th September (M. Kerby). |
| 2020 | Dinton Pastures CP, 16th August (R. H. Stansfield). |
| 2020 | Charvil, two, 24th April (M. Lauri). |
| 2019 | Moor Green Lakes, 14th September (R. J. Godden). |
| 2019 | Eton Wick, 4th June (D. L. Cleal). |
| 2019 | Horton GPs, 13th April (C. D. R. Heard). |
| 2019 | Moor Green Lakes, 30th March (J. C. Morgan). |
| 2019 | Theale GPs, 26th March to 23rd April (K. E. Moore). |
| 2019 | Theale GPs, 11th-29th January, same as Englefield (K. E. Moore). |
| 2019 | Englefield, 1st-28th January (R. Sadjak). |
| 2018 | Fobney Meadow, 18th October to 5th November (A. V. Lawson). |
| 2018 | Lower Farm GP, seven, 16th-23rd September, two on 16th, seven on 18th, five on 19th September, one on 23rd September (N. Cleere). |
| 2018 | Theale GPs, 8th-16th September (K. E. Moore). |
| 2017 | Twyford GPs, adult, 10th May (D. J. Barker). |
| 2017 | Lea Farm Lake, adult, 10th May, same as Twyford GPs (G. Emmett). |
| 2017 | Woolhampton GPs, 17th March (A. E. D. Hickman). |
| 2016 | Queen Mother Reservoir, 4th November (C. D. R. Heard). |
| 2015 | Spencers Wood, 21st December (D. W. Hampton). |
| 2014 | Cock Marsh, adult, 12th May (C. D. R. Heard). |
| 2012 | Sulhamstead, 20th March to 5th April (A. V. Lawson). |
| 2010 | Sulhamstead, two, 4th December (D. Crawford). |
| 2009 | Padworth Lane GP, adult, 30th-31st July (K. E. Moore, R. H. Stansfield). |
| 2007 | Lower Farm GP, 14th October. |
| 1995 | [Twyford GPs, 13th-14th August.] |
