V old capped gas pipes buried in wall

[Reesys]

Ripping out the kitchen in my 1930's house and got these (right where I want some new sockets!)

Gas was all renewed when before moved in, hence the microhose bottom right, which is all new and traces back to the meter. (to the right about 40cm is another capped end, but not causing me issues).
Pipework goes up to first floor and no obvious endpoint upstairs, suspect it's capped under the floorboards.
All the current gas (combi boiler) is new copper and quite obvious, so I'm pretty confident all the old stuff is removable with an angle grinder, however I want to be sure for obvious reasons.

is it a case of getting a gas safe chap out, uncap and check?
the new meter, as I said is all new pipework, I can trace to combi, the microhose bayonet for the hob and the other way for gas fire.

thx

 

[Hugh Jaleak]

For peace of mind I'd get a Gas Engineer in, if they undo the cap and the pipe is dead, all well and good. However, in the rare event it is still live, it'll need recapping, then tracing back, and capping at a suitable point to allow you to remove what you need to.