Dead simple, it's near Hull.
From Birmingham go by the M42 and then A42 north wards to the M1. And then head up the M1 to junction 32, at this point head off onto the M18 (signposted for Doncaster). Continue along the M18 past doncaster and then at junction 5 go onto the M180 (signposted S****horpe). Continue along this for a while and you'll reach junction 5, where you need to come off. There's a big round about here with a petrol station/Little Chef thingy. You need to go down the road after the petrol station one....continue along this little country road thing and it is just on the left.
That should be about right.