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If it's cement originally, stick with cement.
Lime mortar is a lot more porous and soft - on old buildings, it goes some way to protecting the soft bricks by wicking water & degrading, instead of the bricks being damaged.
My guess is that it would degrade really quickly if you used it on modern brickwork. Also, it's just more of a ballache to do, and to find someone that can do it.
NotThamesWater
JonnyC
Recently moved into a 1965, 3 bed semi in North Kent/Sevenoaks area. Some of the brickwork needs repointing which I'm happy to do. I assume this would be cement based mortar at this build date? Should I re-point with lime or keep cement? Is it pointless for breathability if the remaining mortar around the brick is cement based? Would I have adhering problems repointing with lime? Thanks