The "Owl Lady" as she is known around here, asked a few years back if she could site a few owl boxes in the little spinneys and copses on the golf course where I do the wildlife management. I regularly check, clean out, and report any "Owl" activity to her for her records as she monitors the Barn Owl population in the area. One particular box (completely sited in the wrong place for owls) is used regularly by the grey squirrels as a breeding box and also as a weather proof drey for generally laying up in. Ever the opourtunist I soon saw the potential for some serious grey squirrel control here