Update.
Vokera engineer came around and diagnosed a failed wireless receiver in the BeSmart thermostat. As it was no longer under warranty a new thermostat was required. Screwfix had a Tado v3+ on offer which looks like a direct swap as far as functions go so I got one of those. The Vokera...
Hi, we have the above wireless thermost controlling a Vokera boiler. Last night it appeared something had gone wrong and the boiler didn't turn off as timed or when the set temperature had been reached for the CH. There were no errors reported on the thermostat controller box or the boiler but...