Wow, thanks for the swift responses (and the offers!) Wish I'd have found this site earlier, would have saved me a lot of wasted time.
@Verminator - I think the main reason I've failed to secure any shooting is the nature of the farming round my way (West Yorks.). Its more your traditional livestock rather than arable farming so there seems to be little in the way of crops that require protection from woodies etc. and I've not really plucked up the courage to try further afield.
Once again, thanks for the responses. I may well be knocking 'em out of the sky in a field near you soon