You can’t win mate so build what you want no point in comparing prices either as some can self build, some can’t do DIY.
so listen to your QS.
hope hey are on a fixed fee and not a percentage of the build cost.
Don’t you have to notify that works have commenced on site with 7 days notice?
after that if they aren’t coming to site.. that’s their problem.
just take lots of photos as evidence.
you get labels saying this equipment is fed from 2 supplies etc.
stick it with the consumer unit with the other labels that are ignored such as testing rcd's etc
There has to be a large ish m&e contractor about. Check the gas safe register for the qualifications prior to making contact
Explain clearly that you need a certificate and ask the cost.
pay contractor get certificate.
Just remove the plasterboard if it hasn’t been taped or plastered.
if it has get the multi tool out and cut access hatches to add the timber, then re tape/plaster.
It just says it has to be robust.
so you could put in a 3x2 at the correct position rather than 18mm plywood(ing) a large area.
inspector isn’t going to be pulling at them
drill a hole in the slabs
hammer into ground
https://www.simplysafetygroup.co.uk/fencing-pins.html?source=googleshopping&category_id=1546&gclid=EAIaIQobChMI4vbBsK6A-QIViaztCh3gnQwkEAQYASABEgIODPD_BwE
run rope at mid height and high level.