Gas pipe and mortar.

[Wingedharpy]

Looking for advice from those who know.
House is Victorian terrace.
Gas pipe enters house at/by front door via hole drilled into brickwork.
Brickwork around pipe has deteriorated and crumbled away leaving a hole which is letting water seep in.
Is it ok to plug this hole (quite big) with mortar after scraping out all the old flakey bits?
I appreciate this may not give the most beautiful finish but I just want to stop the water coming in.
My concerns were, could anything in the mortar corrode the gas pipe?
I think, the gas pipe has some sort of plastic coating on it.
Thanks.

Anyone?

The gas pipe must be sleeved all the way through the wall (with a larger pipe) and it must be sealed on the inside of the house with suitable sealant, and outside can be mortared or whatever. The reason a pipe must be sleeved is to avoid undetected gas leaks in cavities/voids/behind plasterboard.
Is the pipe before or after the meter? That would affect whose responsibility it is.

Mortar will corrode the copper? pipe but as long as you can see the plastic coating isn’t broken or damaged where it will be in contact with the mortar then it would be ok, clean out any any loose material (with a vacuum if necessary) and wet the surrounding brickwork (I’d use a spray bottle) to stop it sucking the water from the mortar. How big is this hole? Mortar will slump if you try to fill too big a hole, so might be worthwhile putting some brick back in too if you have some sound pieces to hand. HTH

Should also add be careful not to compromise your cavity space ie. bridging the two walls with mortar which will cause damp on the inside wall

Many thanks for responses and apologies for not returning sooner.

Couple of questions:
johnd2 - can you explain what you mean by sleeved?
There is no cavity, void or plaster board involved.
The pipe comes in through a single brick porch.
The area in question is before the meter but the issue is the surrounding brickwork - nothing wrong with the gas pipe itself as far as I am aware.

Canyerjustfixthis - that's helpful, thanks.
Would it be ok to just pack some brick pieces/bits into the hole first and then mortar it over the top?
I was planning on using waterproof mortar - at least that's what it says on the packet.

That would be ok, not sure on the size of the hole may be better to mortar the brick pieces in first then once the mortar has set mortar (render) over it if it seems unstable doing it all in one? Is the gas pipe coming in at a downwards angle? Just watch for moisture running towards/into the wall hopefully it's been fitted with an angle to allow water to run in the opposite direction away from it?

Pipe doesn't appear to be angled in any downward direction, though I haven't checked this with a spirit level.
Pipe rises vertically from the ground then 90 degree angle and runs through wall.
Will patch it up gradually as you suggest.
Can't be any worse than it is currently!
Famous last words.