Chasing Pipes in Walls

[ParanoidAndroid]

Hi guys,

Just a quick question. Currently gutting the bathroom and putting a new one in. Will need to chase some pipework into the walls for the wall mounted radiator/towel rail and wall mounted bath controls etc.

Question is what should I put the pipes in to stop the copper reacting with the mortar, read somewhere that you can wrap them in tape but wondered if there is a preferred method? Obviously the pipes need to be able to expand/contract slightly with the heat.

Cheers,
Graham