I used to get a visitor squirrel in the attic (overhanging eaves). made a hell of a row at night. Paid a guy to catch it and get rid. then got another one, squirrel not guy - (maybe it was a squirrel smell thing). This time bought a trap from a game shooting type place - forty quid for the trap, cheaper than getting the guy around !! (Tip of the Day !)
if you end up trapping them you are NOT supposed to release them.
That cutsey squirrel prancing around the garden becomes snarling hissing scratching biting bundle of hate and fury when you pick him up in that trap - wear thick gloves on that hand. disposal in a large bucket in the easy way....
another one started hanging around but a neighbours cat had a session with him in the bin store and he never came back.
I tried everyting to get rid of the attic visitor - even mothballs (don't ask, he spent half the night playing pelota and or roller skating with the things by the sounds of it). Put a long story about it on the BBC website for Home Truths some time ago, don't know if it still extant. (just looked, board seems deleted and the web archive no good for it. Shame it was an interesting board. Story I wrote was funny enough to be a pick of the week. shame I didn't keep a copy, coulda reused it here)
Squirrels are just rats with good
PR - if you get 'em get shot of them.
but you see them everywhere nowadays in towns so don't worry unduely.
I am convinced that it the action of buying a proper squirrel trap that stopped them coming round, conniving little blighters....