| 2019 | Lavell's Lake, 3, 21st October. * |
| 2019 | Dorney Wetlands, 2, 26th January. * |
| 2017 | Moor Green Lakes, adult male, 26th-28th November. * |
| 2013 | Dorney Wetlands, male, 5th May. |
| 2012 | Great Meadow Pond, male and female, 26th February, also March 11th & 18th. |
| 2012 | Dorney Wetlands, two males, 2nd February to 3rd March. |
| 2011 | Lavell's Lake, male, 9th November to 9th December 2012. |
| 2010 | Dorney Wetlands, male, immature male, unsexed, 4th December to 21st January 2011. |
| 2008 | Hungerford Marsh, two (one male), 6th November. |
| 2006 | Horton GPs, male and female, 7th November. |
| 2003 | Theale GPs, male, 30th December to 23rd February 2004. |
| 1999 | Theale GPs, male and female, 27th March. |
| 1999 | Great Meadow Pond, 20th March. |
| 1996 | Thatcham Marsh, 21st January, 5-6. |
| 1995 | Thatcham Marsh, 29th October, 9-10, birds also present 19th November. |
| 1992 | Summerleaze GP, male, 13th December. |
| 1990 | Brimpton GP, female, 20th May, also 27th May. Trapped. |
| 1989 | West Berks, 26th January, until end of May. |
| 1988 | West Berks, male and female, Present throughout the breeding season and several seen in the Autumn. |
| 1987 | West Berks, pair bred successfully with 8 present following winter. |
| 1986 | West Berks, male, 28th March, 2 male 5th April 1m1f 24th April. Adult + immatures (possibly 5 birds) 3rd June, then singles to 30th November. 3 at a second site 29th November and 1-2 until 6th December. |
| 1985 | Thatcham Marsh, 8th December, 1-2. |
| 1985 | Wraysbury GPs, male, 1st December. |
| 1983 | Theale GPs, male, 5th-14th March. |
| 1980 | Theale GPs, 4 males, 26th-29th October, 6-7, also 25th and 30th October. |
| 1980 | Thatcham Marsh, 19th October, 10-12. |
| 1978 | Wraysbury GPs, male, 5th March. |
| 1976 | Manor Farm SF, 16th October to 13th November, 1-2, also 8th January to 5th February, 3 (2 males and 2 female) 17th October. |
| 1976 | Burghfield GPs, female, 16th October. |
| 1976 | Thatcham Marsh, 1st January, several calling, two 31st January. |
| 1975 | Thatcham Marsh, five in first winter period, 2+ from 22nd November. |
| 1974 | Twyford GPs, 12th February. |
| 1974 | Thatcham Marsh, 8-10, beginning of January to 17th March, also two 2nd November, then 3-4 by 1st December. |
| <1974 | Confidential, many records. |