I'd say at that price you got what you paid for, another £25 to get it tested and the jobs a good un. What did the sales description say about the condition of it and did you see pictures of it before you bought it, that dent could've been done during shipping.
Regs are not part of the test it's only the bottle, you could take the reg off and just send the bottle. The bottle threads are checked though and there's always a slight chance they can be damaged when taking a reg off.
Regs are not part of the test it's only the bottle, you could take the reg off and just send the bottle. The bottle threads are checked though and there's always a slight chance they can be damaged when taking a reg off.