I recently started design works for a design and build contract in Derby. The main contractor's Project Manager is a Notts County fan, and he is a sound guy. When I sat down with him to negotiate the deal, it took him about 2 seconds to deduce I was a Bristolian. He of course then asked which team I followed. He was hugely relieved when I told him City. He did suggest that the contract might have been in doubt had I given the "wrong" answer !
He then went on a rant about the 15ers; and claimed he hated them more than I ever could !!