Couldn't fit Gas smart meter. Pipework issue. Who pays for corrective work?

1. old meter out, new one does fit and all is ok.
2. old one out, new one in but doesn't fit so old one back in, ok.
3. old one out, new one in but doesn't fit so old one back in BUT if the regulator somehow doesn't do its job after being disturbed (its old) i would be left with no gas and require a gas fitter to do something with the regulator.
of course i didn't take the risk of 3, how long would it take to get an gas fitter, anyone knows.
basically, a length of gas pipe is the problem and taking up room that he couldn't be sure would block the fitting of new meter. he suggests re-routing the pipe to outside the box then there will be no problem with space.
is that on me to pay for that work or should the supplier be able to contribute? Octopus Energy is my supplier.
thank you.
see my further post below.
edit: for clarity, gas come from left, out of right, then loops outside box back in to attach to meter. i assume as now i'm looking at the photo i don't know what the red lever is, shouldn't that be before the gas hits the meter? now i have no idea, advice please.
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so its my responsibility?
i need to think about this. do i need the pipe to go all the way from left to right or can it stop where it enters the box if the new meter is different dimensions and could have that flexible pipe at the other side.
hopefully someone in the know can advise.
Dont muck about with it yourself though don’t want to blow yourself and others up.
PS I’m not a gas professional and don’t use any information I’ve said as fact.
the more i stare at that photo i realise the pipe will have to "leave" from the right so indeed its a re-route to put it outside the box, not run back through it.
still any advise appreciated.