Somewhat reminiscent of my own recent experiences - hoping for a
similarly excellent reply TIA:-

Background:- relatives have had a fair bit of "full plans" BCO
building work done within their house and the sparky who did the new
circuits, extensions to existing circuits, bathroom works etc also
fitted a new split load RCD consumer unit, did some equipotential
bonding/supplementary earthing, wired immersion heater, CH boiler, and
did a full periodic inspection (measuring resistances (?) continuity
etc and rectifying the few faults found) KEGCHING!!

Since them completing the work various wranglings have occurred mainly
over overcharging, that has left relatives feeling anxious as;-

- despite repeated asking sparkys have not given (or even shown) them
the official certificates etc that will be needed to give the BCO to
sign off the whole job - sparkys say they will hand them over when
payment made...

- relatives concerned that sparkys may try to have last laugh by
"forgetting" to fully complete said certs or maybe not supplying one
or two that are required to adequately cover the work that's been
done...i.e. once payment has been made they're concerned they will be
on hiding to nothing trying to get missing/ inadequate certificates
sorted out....

Can someone please advise:- what certificate(s) should relatives
expect to cover the work done? and what "last laugh" tricks are they
advised to watch out for when inspecting the cert(s) when they go to
collect and pay the crook-ahem sparks?

They plan to visit the works with a cheque and get the certs "in their
hands" - but of course the only person that can say they are OK is the
BCO...by which time the cheque will have cleared...

Sparks are apparently an established local firm recommended by the
builders, with "Electrical Contractors Association" on their
letterhead - are rellies being overcautious? or approriate in the
circumstances?

thanks for thoughts and advice

cheers
JimK