Vortex12 wrote:

In New Year will be replacing an ancient heating system in a flat. Total
8 radiators with all the piping logically coming back to a single
central point.

I am thinking an 8 way UFH manifold (John Guest) would make a very
elegant solution at this location.

Of course flow temperatures may be 60+ degrees, whilst normal UFH
temperatures are much lower.

Sometime ago I noticed this supplier who makes specific radiator manifolds

http://emmeti.co.uk/products/wall-hung-radiator-manifolds