Remove the head of the motorised valve above the boiler (press in the black button on the left, pull head towards you).
Wrench or plier on valve spindle; gently rotate over the (narrow) range of travel and then leave in the middle of this small range.
Close TRVs on upstairs rads, leaving one e.g. bathroom rad open (fully open if TRV). You have now created a bypass i.e. a permanently open waterway.
Reduce the hours the programmer for the upstairs calls for heat.
You will still find the one rad upstairs will heat when the underfloor zone calls for heat/circulation.
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