Hi - I've flown outta Coventry quite a few times (indeed, I even did my IR there) and I can't recall the last time I was advised of bird hazard either by ATC or through the ATIS... Never seen any birds in the immediate vicinity of the airport.
Let's put things into perspective: once Thomsonfly has received its 4 737-500s, that will ad only 12 flights a day at EGBE; also, there has been jet noise at COV for a while, with Citations/HS-125s/Gulfstreams flying outta there fairly regularly. And some of these are actually noisier than a 737-500...
Cheers