Adding UFH to Evohome - manifold feed

[Sofasleeper]

I am about to add a single zone ufh to my 11 zone radiator set up. The ufh is replacing a radiator as a new zone. I have a set of radiator pipes from the now redundant radiator running to the location of the new ufh manifold. Can I use this supply to feed my ufh manifold via a zone valve located with the manifold or will I need to run a separate set of pipes all the way from from the boiler?

[Richard]

All depends on the size of the UFH system, current boiler delta T, flow rates...