Alternatively, you can do what Prodrive did at Banbury, and build a hangar approx 150m from HT cables (and thus pylons), facing the cables, ie the pad is between the hangar and the cables (and a small river, to boot).
Check
this map. The pad is due west of where the northern sliproads of Junction 11 join the M40 motorway proper, and right by the little "S bend" in the river. The building facing NW out to the countryside from that little bunch of buildings is the hangar, I believe.
On a slightly similar track, and more one for plank-wingers, the strip at Scotland Farm, Hook (adjacent to the M3 and just the London side of the Odiham junction 5) has HT cables none too far from each end of the runway.
Link to that map is
here - the grass strip runs roughly parallel with the motorway.