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JonnyC
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.