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Cheers guys, be gentle with me

I think, as already suggested, building control will be the main issue. At a practical level, i dont get why its not used more either. So simple, and if built like my garage gets over all the problems of the floor wall thermal bridging issues really easily. As for fixing plaster board etc, i glued it up with adhesive foam. Simples

have you considered this option?

Ive got one of those little 10w jobs. Perfectly fine for going in the loft or working in a confined space. Battery life only a couple of hours or so though. Mine came from Amazon: https://www.amazon.co.uk/gp/product/B017OPR8LM/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1 if buying again I'd probably go for the 20w.

Thats exceedingly unfair on MrP I'll pay £50 for one

Don't be sorry ......it pays the bills. .

You can leave a 1700 x 700 space for a bath and just put a big walk in shower in its place - the room will look much bigger and if someone wants a bath then it's not difficult to retrofit.

cavity is 170mm. yes blown in .yes part of beam & block

If you watch all the "usual" build/renovate/auction programs all seem to suggest that in a house of your type leaving the bathroom downstairs is perfectly acceptable and normal. The addition of a WC upstairs if practicle though would definitely be a good plus.

As a BCO i would, and have accepted this several times as an acceptable MOE from a bedroom so long as the window is of sufficient size, not more than 1100mm from floor, access is not obstructed by anything permanent in the room and the window supports itself when opened. However, this is a common sense interpretation of the regs and i could not guarantee that another BCO would be of the same opinion, you would definately have to check it out with your inspector first.

Not just hire a driving one out for a day or two. As you say it will only used for the heavy base and after that your Wacker will do what you need. Much better compaction with the sit on rollers also and more fun!!! Unless you are going to buy a caravan and take up tarmacing drives it's not something that gets used much on any site. http://www.jewson.co.uk/tool-hire/compaction/vibrating-compactors/products/2612/tandem-vibratory-roller/ £235 for a week and probably cheaper locally. Have never seen a trench getting wacked before drainage goes in. You can give it a good squeeze with the digger when you are digging it.