Spanish Gas

I am planning a trip to Spain this Winter for a couple of months (first time). I currently use Calor and have a regulator fitted to the caravan bulkhead.

Thinking that I will use Calor for journey (both ways) and make use of spanish gas whilst there. I understand Repsol is widely available but will obviously have to buy the bottle.

Will I need any special adaptor for fitting and can I get it in UK?

Any other advice much appreciated.

Thanks