"Steve" wrote in message
...
Hi.



I'm trying to change my central heating pipework from an old (I guess
30-ish years) one-pipe system to a two-pipe system. A new boiler in the
kitchen
..
clipped
..
For those interested, here are diagrams of the old and new systems

http://s409.photobucket.com/albums/p...ent=newsys.jpg
http://s409.photobucket.com/albums/p...ent=oldsys.jpg
Cheers
Steve