The message .com
from "Alister21" contains these words:

manifold and then 10 mm microbore.
My problem is this. Am I right in thinking that the flow and return
lines should serve two seperate manifolds? My system has them both
flowing through one manifold with the 10 mm microbore flowing and
returning from it. Is this right?

You sure it isn't one block with two passages, one flow, one return?

--
Skipweasel
Pay no attention to the man behind the curtain.