TonyT

Whatever works for you, mini digger mixing it, filling gorilla tubs by hand and tipping out, your shout.

Add sand into the top soil mix to allow for aeration and drainage. 50/50 mix.

Use the draw cord that’s in the duct to pull in a blue rope, then tie the cable and another blue rope onto it and pull

Easy through a 100mm duct….

Try the national wholesalers or specific electrical in your area. like CEF, Edmundsons etc

Move house if it’s that bad for your health

Just make up some bullshit to keep the BCO happy. a signature is all they are looking for to pass the blame elsewhere. just make sure you do the remedial works like the overboarding.

Get some kitchen foil, tape it to the wall, sealing all the edges with tape. leave 23.5 hrs and remove. See if moisture is present under the foil.

https://www.hanson.co.uk/en/ready-mixed-concrete/reinforced-concrete im doing a job soon with it, it’s about £40 a cubic metre on top of the concrete price in my area at least so about £130 all in a cubic metre for C35.

What about fibres instead of steel? Saves a lot of work!

Is this under permitted development?

Dwang is generally a Scottish term for a noggin

The RCD and mcb are wired incorrectly and the earth shouldn’t be tied at the neutral on the RCD best get a sparky in!

Keyholes letterboxes water in traps service penetrations.

It’s 62.5mm insulated plasterboard the OP is using. kingspan insulated board for example should have a lap of timber at least 19mm at sheet joints/ where joints between sheets are unsupported by the timber framing, timber noggins should be installed.

On the ceiling?

Good shout

What’s the humidity like in the house? amazon sell cheap units for about a fiver that will help gather data

Find source of water ingress Replace timbers? wood hardener and filler?

didn’t realise you were linking to alarm system fitted these back in the day.. https://www.alertelectrical.com/gjd-emerald-3000-mk3-lighting-controller-gjd010.html?utm_source=google_shopping&gclid=EAIaIQobChMIrNfX7NSw-gIV5OjtCh3bTgIjEAQYCSABEgKytfD_BwE

Generally it was always the furthest point from the bathroom door, up high..

Raising the temp and ventilation is the key though not the paint choice

Depends where the fire compartment is, and if these are needed.

Zinsser will seal everything so no need to use bathroom emulsion paints. normal paint and increase the temp/ventilation.

Put the light on, the dazzle will prevent them seeing the gap!!