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Yes 150 min, wouldn't hurt to be more

Exactly the same at my lad's place in E7.

Rafts are just what the say on the tin: they can move as the soil m/c alters. The trick is to make them strong enough not to break their back so the structure doesn't suffer differential movement. This is in direct contrast to strip or piled foundations where we strive to get down to ground...

You don't say how big the room is, but I've seen normal 2 storey brick built houses founded on a 200 raft with thickened edges (still a raft!), so structurally should be fine. I'd be more concerned about water ingress: I assume you're dropping the floor to keep overall height within PD limits...

It may well have live cables in at as sometimes sparkies will just pull in rew cables in. Found this at both son's place and our new abode. At son's it was thin wall stuff and I cut it with a normal pipe slice but in our place it's at least 2mm wall thickness and the pipe slice won't fit so out...

Old electrical conduit without the ag of cutting threads. Found this in my son's place.

Nothing to stop you making a simple jig and using a hand saw if you really want to be cheap/

What does new roof mean? Did it pond before and did you ask to have the levels adjusted or just bang a new membrane down?

There's nothing I can see in that pcicture shouting replace me: no sagging, no broken tiles , no eroded tiles, no tiles sitting wrong, I'd try repair but £7k does sound a lot.

Careful measurement and cutting is all you need. If you have a lot to do then think about making a simple jig

Start over if the old ones that bad: probably keep the slab as you suggest

Some BCs do require firedoors to bathrooms where needed elsewhere, When I challenged it the first time round, argument was that piles of clothes in an airing cupboard with an immersion heater represent a fire risk. TBH I simply mark the doors to be firedoors on the drawings and wait on BC comments

The old adage is "plan the lift, lift the plan" Without knowledge of the site it's impossible to say if you could even use crane (at least a normal sort of size). Genie lifts are the normal method (different capacities available) but need a solid level base or cdbe's chain block with a...

Correct information wuld be a bonus.

How about puttiing up the after pictures? That is terrible for 1 days work let alone 6.

The dpc also stops grout loss into the subbase when the slab is cast, but even without that why would you not want to keep the floor as dry as possibe for the sake of a few quid??

You'd normally screed a slab and a good screeder will produce a finish that needs no levelling. If you don't want to do that then a powerfloat used properly will give you a suitable finish

Opening up with an auger bit?

There's a gap on the left too. Nothing to worry about.

Genorous today!