A few years ago I started using our local “farm shop” for our 7kg gas refills! Cheaper than any other supplier locally!one ran out last year and I forgot and with the other getting a bit low I thought I would get one from the campsite we were on!But no they wouldn’t change them as by now of course my original Calor bottles have been changed for non calor ones!Luckly we managed and now home so can get a refill from the farm shop but I thought I should warn others