Permanent live - as I had before. The idea was to introduce a switched live, of course, plus some other upgrades (wireless controllers etc. - which all work fine).What do you mean by the non-switched manner?, is the boiler now stopping/starting from the programmer/mid position valve in all modes or have you a permanent live from somewhere and the boiler is permanently on just starting/stopping on its boiler stat?.
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So far I have not tested with a multimeter - I do not really like opening the wiring centre when the power is on. So it could of course be a neutral connection. If I 'lost' one neutral (say the boiler neutral, which was the latest change when I swapped from 3 core to 4 core cable, was 'dodgy'), could that cause other devices attached to the spur to stop functioning (even though they worked fine before)?How were you testing for a feed? With a multimeter? Sure you've not lost a neutral somewhere?