OK, the saga continues. Rentokil Man (Trevor) contacted the leaseholder to say he'd seen no evidence of squirrels. The leaseholder also now thought they didn't own the land the offending trees were on. They were trying to contact the owner.
Oh great! I'm hallucinating and the squirrels way in may stay....
But, this morning Trevor has scored and caught a squirrel
The leaseholder has been told that they might, in fact own the land and be able to cut the trees back. A Ranger sent by the leaseholder has seen the squirrel in the trap so my case looks better again