In an earlier contribution to this discussion,
Stephen wrote:

On Thu, 20 Nov 2008 21:19:03 -0000, "Roger Mills"
wrote:

I was meaning the former but - on re-reading the OP - maybe that was
about the latter.

Sorry if I was not clear; you were right first time. It takes forever
for hot water to get to the downstairs taps, so I just want to
circulate hot water around the pipe work to get instant hot water;
there's no need to increase the pressure AFAIK.

In that case, I wasn't right! I was talking about increasing the pressure -
or, more precisely, the flow rate from cylinder to tap - rather than about
constant circulation.
--
Cheers,
Roger
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