2019 | Queen Mother Reservoir, first-winter, 10th February to 29th March. * |
2018 | Colnbrook, 19th January. * |
2017 | Wraysbury GPs, first-winter, 19th February, same as QMR. * |
2017 | Queen Mother Reservoir, first-winter, 8th-20th February, same as Wraysbury GPs. * |
2016 | Knowl Hill, first-winter, 16th-19th December. |
2016 | Queen Mother Reservoir, first-winter, 3rd February. |
2016 | Knowl Hill, first-winter, 12th January to 8th March. |
2015 | Queen Mother Reservoir, second-winter, 14th February. |
2012 | Queen Mother Reservoir, first-winter, 28th January, also Jan 30th, same as Horton GPs. |
2012 | Knowl Hill, first-winter, 23rd January to 12th February, same as Horton GPs. |
2012 | Horton GPs, first-winter, 22nd January. |
2011 | South Lake, Woodley, first-winter, 10th-15th December. |
2008 | Colnbrook, 25th February, also QMR 25th February. |
2008 | Colnbrook, 12th January, also QMR 12th-13th, 20th January, 6th and 10th February, Withy Bridge 14th February. |
2008 | Queen Mother Reservoir, first-winter, 1st January to 15th February, also 6th, 29th and 20th January, 3rd, 9th, 15th February. |
2007 | Queen Mother Reservoir, first-summer, 2nd May, again, 4th May. |
2006 | Queen Mother Reservoir, first-winter, 26th December. |
2005 | Queen Mother Reservoir, first-winter, 26th February, also 3rd March. |
2005 | Burghfield GPs, first-winter, 14th February. |
2004 | Newbury, adult, 29th December. |
2003 | Queen Mother Reservoir, second-summer, 11th April. |
2003 | Queen Mother Reservoir, second-winter, 20th February. |
2002 | Lower Farm GP, first-winter, 26th January, same as Burghfield GP, 7th-25th January. |
2002 | Burghfield GPs, first-winter, 17th-25th January. |
2000 | Queen Mother Reservoir, first-winter and third-winter, 9th February, also 2nd March, first-winter also seen 17th-18th February. |
1999 | Queen Mother Reservoir, first-winter, 21st December. |
1998 | Queen Mother Reservoir, first-winter, 5th February. |
1998 | Queen Mother Reservoir, first-winter, 30th January, also 4th and 7th February. |
1998 | Theale GPs, adult, 28th January. |
1998 | Queen Mother Reservoir, second-winter, 20th January, also 29th-31st January, 13th and 26th February. |
1997 | Wraysbury GPs, 25th January. |
1996 | Moor Green Lakes, 11th February. |
1991 | Cock Marsh, 15th February. |
1989 | Moor Green Lakes, adult, 3rd December. |
1989 | Burghfield GPs, first-winter, 25th-26th February. |
1989 | Burghfield GPs, adult, 20th January. |
1987 | Holyport, adult, 17th November. |
1987 | Cippenham, Slough, first-winter, 2nd November. |
1987 | Burghfield GPs, immature, 16th January. |
1986 | Theale GPs, first-winter, 15th February. |
1986 | Wraysbury GPs, first-winter, 13th February. |
1986 | Queen Mother Reservoir, first-winter, 1st January, also 11th February. |
1985 | Burghfield GPs, first-winter, 23rd January, also 26th January. |
1985 | Wraysbury GPs, 17th January. |
1985 | Wraysbury, 15th January. |
1985 | Wraysbury GPs, 14th-16th January. |
1985 | Queen Mother Reservoir, first-winter, 12th January. |
1982 | Holyport, sub-adult, 13th February. |
1982 | Manor Farm SF, first-winter, 2nd-4th February. |
1980 | Theale, first-winter, 10th February, same as Manor Farm SF, 16th-18th January. |
1980 | Beenham, first-winter, 3rd February, also 10th and 17th February. Same as Manor Farm SF, 16th-18th January. |
1980 | Manor Farm SF, first-winter, 16th-18th January. |
1979 | Wraysbury GPs, adult, 27th December. |
1979 | Wraysbury GPs, second-winter, 25th February, same as Holyport, 18th February. |
1979 | Holyport, second-winter, 18th February. |
1978 | Holyport, adult, 9th December. |
1978 | Holyport, 16th October. |
1978 | Holyport, 24th February. |
1978 | Holyport, first-winter, 14th January, same as Manor Farm SF, 12th January. |
1978 | Manor Farm SF, first-winter, 12th January. |
1977 | Manor Farm SF, first-winter, 3rd December. |
1977 | Manor Farm SF, sub-adult, 7th-8th April. |
1976 | Holyport, adult, 6th November. |
1976 | Manor Farm SF, immature, 15th-23rd January. |
1975 | Manor Farm SF, first-year, 10th December. |
1974 | Queen Mother Reservoir, 18th-19th December. |
1974 | Windsor, first-winter, 13th March. |
<1974 | Confidential, many records. |