So went to switch off at the consumer unit and the switch is stuck!!! It comes out about halfway and that's it. Wondering/ hoping that's the issue!
It's a Hager unit and the switches are ones that have fuses in, I've attached an image of the unit, the main fuse on the right is full out, the lighting circuit on the left won't come out any further any hints or tricks before I call out a professional?!
I'd also note that none of the RCDs went (either the main one on that consumer unit, or the feeding RCD on the consumer unit in the house)
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