Is it OK practice to run a gas pipe from the meter (inside house) back to
the outside and back inside another room? Probably about five metres would
be outside house.

No gas in the kitchen (electric cooker) but now looking at possibly changing
to gas cooking. Unfortunately, no straightforward way of routing the gas
pipe inside.

If it is OK, should this pipe be underground or would it be OK clipped to
the outside wall, suitably protected?

Thanks
Tony