New jcn box fitted and all wiring back “as was” well almost
did best I could with wires that were literally cut to length like guitar strings ! But bit neater, easier to see what’s going on and all cables now identified and labeled
plumber had used the switch live (yellow wire) also connected to live to pump, cylinder stat switched live, 3 port switched live and frost stat switched live - he had used that at the boiler as the live and bridges across to RT
As there was a spare red wire (boiler cable) not used between junction box and boiler I have wired that as Live on boiler (removed bridge wire between Live & RT) and permanent live in jcn box, the boiler yellow wire linked in paragraph above, I have now wired to RT
all seems to be functioning correctly now and boiler now reacts to room stat and cylinder stat as I would expect
my only question now is how should he have wired pump to X14 connector?
AND - more importantly, what, if any action should be considered against the installer? Fuming really as I paid £350 + vat Labour to fit replacement boiler