Honestly I cant believe this, finally managed to save enough to sort out and afford the volkzone offer, just got home with the cylinder pleased as punch, other than the fact they didnt sell the cylinder key (so that'll be ebay) but I've just gone to fit my regulator and set up to find the following!
and
aaaaaaaaarrrrrrrrrrgh So now I have to wait for both a key AND an adaptor to come in the post.
I knew that the regulator I have came off a BOC cylinder, I didnt know there were different connections between argon and co2 cylinders!
Why the hell is this or is my usual cynical brain right this time that it's so they can make more money!!