"You need to allow for obstructions, hedges etc, so 04/22 has less than 665m useful length)"
Indeed it
does have obstructions - landing on runway 22 involves crossing a railway embankment with HV power cables directly on the airfield boundary. If you're not used to making fairly steep approaches be warned! Similarly if departing on 04 you have to climb out over same.
This picture:
http://www.photomugsonline.co.uk/nrgallery/270311a.jpg shows the embankment, and if you zoom in and look closely, the power lines.
The runway is quite undulating:
http://www.photomugsonline.co.uk/nrgallery/030110zg.jpg There is a warning tape visible in this shot, but whether it's still there I don't know. The church is actually further away than it seems, and is not a problem.
Airfield website here:
Northrepps Aerodrome