Tenthredo arcuata or 'Very Wasp-like Sawfly' to give it its new common name.
Brown Trout in the stream. According to my ancient Observer Book of British Trout, this has the latin name of Salmo trutta fario, which means it is a sub-species of Trout. Press your nose up against the monitor and you should be able to see small red circles on the lower half of the fish which mean it is a Brown Trout (now turn round and try and convince the person watching you that you're not going potty!).
This was quite a large spid - the sort of size that you could make a Sunday roast out of. As for its ID? I'll have to wait for the Puttenham's answer to Spiderman to help out.
White Ermine - almost virginal