nothing is wrong!!! honest!
the system works fine, the motorised valve is in the correct place, sited AFTER the vent and feeds in the hot water tappings, as verified by a qualified plumber and gas engineer.
i have NO issues, the hot water is fine and the heating is fine, the control circuit operates correctly and the boiler stat closes and opens the gas valve perfectly.
i was merely enquiring as to weather the mods required a resetting of some sort.....as i didnt want the boiler to be doing work for nothing..
my idea of what range rating was, was incorrect and i now stand corrected!
the c plan was to save me money, The TRV's were added to aid control of upstairs temperature which was always around 1-2 degrees warmer than downstairs where the roomstat is and the boiler stat was replaced due to it being faulty, setting it to a low setting held the burner on for longer, and setting it high shut the boiler off almost completely!!
nothing sinister here!