Right I have been searching the internet to try and find this out for diffinate
I have found the following
December 2004 Hertfordshire sightings Archives
27TH DEC: AMWELL: Bittern on small pit just N of public hide for c 20 mins (D Ling): WILSTONE RSVR: Little Egret (A Lewis): STOCKERS LAKE: 4 RC Pochard, 5 Smew, 3 Goosander, 5 Goldeneye (A Nasir): MUNDENS ESTATE: 10+ Green Sand, Water Rail, 20+ Teal (P Holpin): TYTTENHANGER: Greenshank, c210 Lapwing, 16 H Gull (over) (G Knight) 2 Stonechat, 3 Snipe, Kingfisher (S Pearce): BENINGTON: Willow Tit in Oxshott Wood,
4TH DEC: EAST HYDE: Jack Snipe on scrape, also Snipe & Grey Wag (D Stanley): POLICE PIT, CHESHUNT: 4 Smew (2m) (F Hurst): N MYMMS PARK: 10+ Bullfinch (inc some Northern Bullfinches), Buzzard, 2 Woodcock, 70 + GOlden Plover, 100 Redwing, 9 Goldcrest, 12+ Lesser Redpoll: AMWELL: 4 Little Egrets in trees along R Ask (nr Ash Walk), also 4 SNipe over, Kingfisher, 7 Goldeneye (2m), Water Rail (showing well from reed bed hide), 2f Bullfinch (D Wheatcroft) 3 Water Rails from reedbed hide at 1600, also 2 Wigeon from viewpoint (C Hughes): ASTONBURY WOOD: Willow Tit
So they have become extinct from January 2005 one month later
http://www.hertsbirdclub.org.uk/2004.html <----------- website where I found the above!
Sorry!