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In the original picture the frogspawn looked a bit odd - flattened in places rather than rounded. In the added photo (different location nearby - 14/3/13) I noticed a duck approaching and wondered if that could be the explanation - ie, that the ducks had been trying to eat the frogspawn?
Unnaturally large numbers of waterfowl are bad for all biodiversity in a water body!
Lat/Lng: 54.564, -5.938
OS grid ref: NW455258