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As @Backstop says, it's old meter connections. We have the same in a cupboard after the meter was moved outside. They guys doing it (SGN) said we could remove it, but we'd have to take their word that it was disconnected from the main supply and not just capped. Even if it was disconnected, there would still be a gas smell if we hacked it out, so it's hard to be totally sure when you start doing it.
Just look for anyone local who is Gas Safe registered. Likey they would just cut it back to a point where it's not intrusive any more and just cap it off there. Removing everything from the point it enters the building/leaves the main supply would be a bigger job. But you could spec that if you want.
yep, definitely not going to do it myself! any recommendations SE london? and thank you!