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Yeah my blue arrow should be orange, poly up to the floor level, elbow, then copper. No affect on anything else as far as I can see, earth bonding will still be possible, just routing that copper pipe below the meter and skirting. One issue is that the stopcock sticks out further than the meter, in turn making the box bigger and stopping my door from opening fully. That's not the whole reason for replacing, but something that can be improved whilst I'm at it.
An alternative might be locating the stop tap under floor level but making good will be a little trickier as to leave room to service if that ever fails in future.
Polygon
Which bits will be poly pipe and which bits will be copper and how will it affect what is already there?
From memory the gas meter needs to be earth bonded to a copper water pipe within 600mm (I think) of the meter.