Tree guards

Once more all our cherries have been taken from our 4 trees. They are well netted so it cannot be birds and this years rain has proved that it's not two legged thieves, no footprints in the mud. So it has to be the mice that plague our allotment (Wood Mice?) Does anyone know of anything we can put around the trunks of our trees that will stop them climbing up to get the fruit?

-- Regards
Bob Hobden
Posting to this Newsgroup
from the W.of London. UK