Thanks Jack. I have copied this piece from the site:-
Simply swap any brand, condition or type of BBQ gas bottle up to 9kg in size for a full one at any SWAP’n’GO outlet.
I will take 2 x 4kg's and 1 x 3kg to my nearest outlet. What are the odds of me getting a straight swap ? The wording worries me.... BBQ gas bottle and up to 9kg....
OH and thanks KEV, I may have to change the nicname....
Have a safe Xmas all you campers...................
Phill