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Both pal. Trouble free motoring then. ? Have a good 400mm of pipe before the AAV to allow air to accumulate.

Respectfully, I think @Vistihas made his point - not revisiting!

You seem to me making the "mistake" of having the FFL level with the outside ground. I would not want a suspended floor like that. For a start how do you ventilate it? Aim for the bottom of the suspended floor structure to be slightly above ground level. Then your frame can start at FFL or even a bit below, not raised up as you have it. I am not even sure that would pass building control. We had to ensure the floor underbuild had to be brought up to at least outside ground level.

?. You must have just caught them on a good day ?

An alternative could be a crane and hopper to lift the concrete to where you want it.

Great advice @Nickfromwales which I've followed. Went to Garscube industrial estate in Glasgow as they have three plumbers merchants close to each other. Young Callum at Plumbworld gave me a small double radiator for free and insisted on carrying it to the car too! Graham's had nothing but phoned another branch who unfortunately had just sent a 4 year pile to the scrap merchant. Next up was PlumbCentre who gave me a huge double for 20 quid, nice fella said he'd give it away but company policy requires an audit trail. Result, and for all the poor experience's buildhubbers are having, remember this, people are generally nice, kind and helpful. I told folk it was a charity job and like, their chance to do a mini DIY SOS but without the publicity. Was met with a huge smile and you're welcome. Few guys in the merchant queue commented too, well done son, you don't ask, you don't get and do on. Nice experience pre Christmas and saved £160 for a couple of hours driving around.

That picture looks cool - not sure it's quite me though. I said about building out a bit too but builder wasn't keen - though he'll do it if it's what I want. Don't really think it is necessary though. So long as the door opens out or is bifold or something I think there is plenty of room. I was thinking of something like this for the loo - really like the idea of tanking it as a wet room though, Even if It's just for a had held shower. Would work if I was temporarily immobilised or this Totally opposite but both appeal in different ways

This thread reminds me of a loo in student digs that was so small it had knee holes cut in the door.

Unless it's a hotel your building your talking 1 day to pull the ducts to where they need to go and once plastered out then depending on how many vents you need cut out then another day maybe 2 if you have lots of vents. All of which you can easily do on your own. All you need is a step ladder, a saw for cutting the ducts, a plaster board saw for cutting the holes in the ceilings and a swear box. Just get a price from bpc to commission it or if I am correct there is the tool floating about between members that you can use to do it yourself.

Doubt you could get a toilet and sink more compact that this. If you could fit a sliding or bi-fold door then the room could be tiny. https://www.ukbathroomstore.co.uk/aquarius-combined-spacesaver-wc-toilet-and-basin-aqsswc And it saves time too (at least for men) - wash your hands WHILE have a p**s.

I'm trying to future proof. At the moment, it is not a problem at all - good for me to use stairs - but I'm 63 and intend being carried out in a box. We've got around 900 x 1300 - not sure that meets regs. There will be a bathroom/ensuite on the entry level and the same but bigger on the upper level