It's a Schneider RCBO. The CU is an old square D QO board that I can still get new (although ecoensive) parts for.

Every circuit I touch is being upgraded to RCBO from the original MCB's. When I moved in, the only RCD's in the place were on the electric shower and one of 4 socket RFC's.

You shouldn't fit Schneider (or any other non-square D) devices to a square D board without the explicit 'OK' from Square D.

All MCBs/RCBOs vent super heated gas when they trip. The manufacturers design them so that that gas is vented away from any parts it may damage or cause fire to. By mixing manufacturers you are probably venting hot gas where it may cause damage.
 
You shouldn't fit Schneider (or any other non-square D) devices to a square D board without the explicit 'OK' from Square D.

All MCBs/RCBOs vent super heated gas when they trip. The manufacturers design them so that that gas is vented away from any parts it may damage or cause fire to. By mixing manufacturers you are probably venting hot gas where it may cause damage.
my arse vents super heated gas. should i be worried about non square ARSED BREAKERS?
 
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Thanks for the replies all - I've been offline for a while.@dksanders - I called square D (who are now part of Schneider) who confirmed it's ok to fit the device I fitted. In addition, there are several others fitted by the previous owner and passed by the electrician doing the EICR before I moved in. (He did mention that he hadn't physically checked all the cable runs, however, as expected, since some of them are inside walls).
No signs of any overheat or other damage, it's just a total mess. Literally the cables are just thrown into the loft space under the thermal insulation. I just didn't want a possible insurance claim denied in the event of a fire simply because the cables aren't clipped.
 

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Extending wiring - how should I secure the existing untidy wiring?
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