I am too far to be any use but if you use facebook then join Kent equestrian grapevine, there are some very helpful local people on there that may be able to help. Good luck
Janine Lamy is at Carmen Court in tonbridge/golden green ? she may be able to help you, she is an instructor who travels and runs alot of clinics locally so she may know of something, she has her own website with contact numbers on.
I really feel for you
Its things like this that make me breath a sigh of relief that mine are just in rented fields by my house. No facilities except running water which can be a pain esp. in the winter but the peace of mind is well worth it xx