Lesser spotted woodpecker dining on the peanut feeder just now.
Incidentally Keith, we have one of those cages on the right protecting our seed feeder too. I put it there to keep off the wood pigeons who would empty the feeder rapidly whilst preventing access for anything smaller. Peanuts are in a stainless steel mesh feeder which, although accessible by squirrels, seems to be too tough for them to bite through so they just nibble what they can whilst hanging upside down.