how to repair radiator pipe

[vv1234]

Two radiator pipes running close above each other and close against the wall (as they normally do).
I have a leak in the bottom one (leak is in the wall between 2 rooms). I need to replace the bit of pipe by cutting it on both sides of the wall.
It's running close against the other wall and 2nd pipe is just above it.

How do I cut it - pipe cutter can't go in, and if I use the hacksaw I have to cut both pipes at the same time.

[kbrownie]

Hi, I think I understand your problem. Can you determine where the leak is? is it posible to drain system and close the hole with solder? if not i'd cut and replace them both, a bit brutish. But seems logical.
Keith