Gary
Website is www.chateau-gandspette.com
I have only stayed overnight it is a pleasant site in a fairly rural area,which Champion supermarket in village,and you are handy for Calais,the autoroute and the top half of France and only a stones throw from St Omer.The toilet/shower facilities are good and there is a pool and restaurant of which I have heard various comments but one mans meat....(excuse the pun).
The electric is supposed to be I think 6 amp but le patron when asked about this said 'no problem' and we had just about everything on without a problem.I would guess it would make a good base for what you want.