Here is another scenario what would happen if i lit a match in a gas holder
To release gas left in pipework get a blowlamp, fire it up and point it into the pipe containing left over gas, this will ignite. blow up meter, half of house and yourself, if after this you can find your arms & hands, nose around in ashes to find piece of pipe, cut it, using a bit of wire wool & your teeth, clean both ends, flux & solder, perfect!
The surest way to get the gas out of the pipe is to disconnect the pipe, take it into the garden, and rinse it out with the garden hose.
You're all neglecting the obvious. Ring BG and ask them to switch over to nitrogen whilst you are doing the work. Once it's complete they can switch back to NG. There will be a cost implication but this can be reduced if you co ordinate with the local area and ensure that all work is scheduled to take place at the same time.
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