I fly with 631 VGS at RAF Sealand now and would have to disagree with some of the comments above. Yes the field is not the smoothest, but it has been rolled recently and so is slightly improved. I would not say it was a lot worse than Barton (which I also fly from).
We do have a resident powered aircraft living in our hangar who manages to get in and out and length wise it is no problem. With appropriate short field t/o and landings the jarring due to the bumps should be kept to a minimum!
Bose-X, if you'd like to PM me I can give you any more information you need and a contact to obtain permission for the landing. I'm sure you could also arrange temporary hangarage.
Arclite, would be interested to know who you are - PM Me!
Cheers,
Stedders