Larger peanuts in the dispenser tubes don't seem to have defeated the blue tit. By mid-afternoon yesterday, some five hours after the contraption was put out, he had discovered how to pull out a match to access a peanut - and this blue tit throws the matches around the place.
We had to take the dispenser in overnight as the local pine martens are very partial to peanuts, but within an hour of it being out again this morning a peanut had gone, and....
....this has continued all day.
Sadly, the blue tit which is doing this - and we assume that it is a blue tit each time - is avoiding us, so only one fleeting opportunity has occurred in which I might have got a picture, but he was too quick.
Many thanks to Derryck for providing us with so much enjoyment - and frustration.