Campingaz availability

After years of caravanning with room to use whatever gas bottle I wanted we have changed to a Lunar Vacanza camper car and Lunar have gone for the Campingaz R904 bottle. So far I have not been able to buy one locally (even though web searches show availability) as stocks seem to be zero. Do club camp sites have campingaz R904? I could modify the gas locker to take R907 if that is more widely available but no chance of grtting a Calor bottle in. We will never tour out af UK so Calor would be my normal choice. I should have done my homework before we bought! It now seems we are stuck with expensive gas and butane rather than my prferred propane.

Martin