Question about signing off electrical work

Hoping a knowledgeable member can advise.

The flat upstairs have having a new kitchen fitted, including electrical work, and one of the contractors has sawn through the lighting circuit for our flat - we've only just discovered a lot of our mains circuits run the floor void of the flat above.

I've explained to the owner of the flat that I'll need the repair signed off and a copy of the paperwork.

I know it can be self-certified by the contractor as long as they're registered.

I've had a quick google regarding building regs and I'm confused as to what certificate I need for this type of repair.

Jumping in on this older post — for lighting circuit repairs, you’ll need an Electrical Installation Certificate if it was new work or an Electrical Installation Condition Report for checks. It’s crucial to have a registered electrician handle it following Part P of Building Regulations. Anyone else faced similar issues with shared circuit access? Would love to know how folks have handled it!

You might want to get an Electrical Installation Certificate (EIC) for the work done, as it shows compliance with regulations. I once had to deal with a similar repair and found having a certified electrician signed up for the job saved hassles. For reliable services, I used https://mrelectrician.sg/. Their team was quite helpful and ensured that everything was up to standard.