On a less Dibbler/Baldrick note, it may be worth speaking to the allotment officer at the council. If we have a problem with rats they send someone in. I note that said someone has been in recently as the big black things marked poison are laid at various spots around our site. Your council may have a preferred method/poison and may also prefer to have control of who is putting pesticides etc down in these instances.

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Bright Blessings
Earthbabe
If at first you don't succeed, open a bottle of wine.