In an earlier contribution to this discussion,
Pete Scott wrote:

Many thanks John - I appreciate your help...and you were right!

Kind Regards - Pete S

That means that your system needs balancing to ensure that all radiators get
an equitable share of hot water when they are all on.

The balancing FAQ at http://www.diyfaq.org.uk/plumbing/rad-balance.html may
help.
--
Cheers,
Roger
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