OK - had a closer look and the eggs are in peach trees. Trees about 12ft high, eggs about 8ft - the forming fruits don't appear to have been pecked or chewed. The net bag is carrier bag size with quite a lot of shells in (maybe 2 doz eggs) - I have a picture! Don't think deer are a big problem around here although there are a few about in the wild wood across the river by the lake where the trees are. The chasse are very efficient so there aren't many 'pest' animals around here. There is also a strange metallic box under another tree - do da do da (twilight zone music) I have noticed more than usual numbers of airforce jets flying very low here just lately!! Blimey!
Liz