Had a bit of a nightmare weekend when we discovered that the consumer unit had developed a fault and the power started becoming intermittent.
Managed to get an electrician out yesterday and TBH I am happy to still be here. The RCCB has melted and the heat has buckled the busbar. Glad we were in TBH as I dread to think what might have happened if we were out and this had gotten worse.
The electricians opinion was that the RCCB hadn't been 100% seated correctly and this was causing a minor arcing problem which over time caused the damage to the RCCB, MCB and busbar.
All offending items have now been replaced and I am getting a full EICR (Electrical Installation Condition Report) carried out later in the week just to be 100% sure going forward.
Photos of the offending article: