As far as I know, Haddenham strip is deserted all week, with the gates locked and a big barbed wire encrusted fence around the road-side of it (they had a problem with "travellers" a few years back). So on a weekday you might tear the a*** out of your trousers getting off the strip.
I'd agree though, there are polite ways to say "no"
I've seen light a/c there at weekends, but encountering winch launch cables either in the air or on the ground can be detremental to the health, so everyone needs to know what's happening in advance