Just been into our local caravan / motorhome / camping type shop. They didn't have what we needed (I've ordered online instead) but we did ask about a refillable gas system..... around £400 fitted he said. 'OW MUCH!!!!!!! I thought. He said all cyclinder now have to be R67 rated (which I knew) and all fillers on the exterior of the vehicle plus it would be necessary to have a certificate of conformity for both the system and fitting. Hummmmmmm not sure about the filler on the exterior and a certificate for the fitting - anyone know anything about that? At £400 I would continue to get calor as not worth having the refillable fitted. The place I get my gas lifts the new cylinders out and in for me and does the connections. If you have to have a certiicate for the fitting it means you would have to have them refitted by a "specialist" when swapping vans as well.