I think you have to decide whether you are going to try to get a place aginst the fence or choose somewhere fairly central in the main parking area. If you are against the fence I would think you will miss out on some great panning shots but can hopefully get some take offs and landings, assuming you can get a position clear of parked aircraft.
If you look at the heading photo at the top of the Shuttleworth website “Travelling To Shuttleworth” page you will hopefully get a bit of an idea of what I mean. Somewhere in the middle of the cars at the top of the picture I think could be about right, as the aircraft tend to do a sweeping pass around the crowdline fence whilst doing a fly by. This is the beauty of Old Warden for photographs, you can actually get a topside pass – if that’s the right term ?
This has worked for me at the couple of airshows I have been to there in the last few years – the last time in June 2016. However, I haven’t been to a Race Day so the flypasts may be a bit different for those ?
I think the photo on the page below really does give a good idea of, or at least a good section of, the Old Warden airfield layout !
http://www.shuttleworth.org/travel/
Cheers – Ron