Will your field have a quarry at the end as well as a ski ramp like Crosland? Maybe you're just satisfied with a 1000ft mast to look out for in the murk.
Seriously good luck with the venture. Phil Irish at Truro knows all about dealing with the Planners, but Mike Woodhouse at Oaksey also has had a long and expensive dialogue (battle) to keep his field on the map. The PFA is a good call at Shoreham.
They all seem to think that if you mow a 400m strip a bit close you're going to be competing for LHR traffic next.