Storage in Middx advise please

Hi all, living near Uxbridge in Middx and currently storing caravan on a farm in Harefield. Its a working farm and recent increased activity often means our van is blocked in. Does anyone know of a good secure storage facilty in the area?

Unfortunately the CC storage is not close enough. Would be happy to store at Rooksbury Park but its only part year storage so as an alternative somewhere near Wickham would also be suitable. Thanks for any help in advance.