Not the cheapest way but the easiest now is push-fit in either copper or plastic (has o-rings inside). I haven't yet come across a push fit that will slide right along the pipe to allow a section of rigid copper to be slotted in an existing run hence, I guess, the bit of flexy in the Focus kit.
They do slip couplers in copper for this but sometimes draining down enough to solder is a pain.
If you do use push fits it's important to know if they are removeable or a once only type as you can't take off the once only type to re-do an incorrect length etc.
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