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If I could kill 2 birds, I'd be spoilt for choice and the wife had a good chance of surviving...

As above me and the sparky are installing first fix tomorrow, any tips appreciated all supplied from BCP should be a fun day

Soudal Low Expansion Soudafoam, this one: http://www.screwfix.com/p/soudal-soudafoam-expanding-foam-gun-grade-750ml/5026d?_requestid=448445 Make sure you get the Low Expansion one as they do a couple very similar looking. I used it to fill gaps behind my EPS upstand where the wall tapered. Also used to fill in missing chunks of render, see by the old doorway on the left and across the back wall where the soil pipe was. I hoovered the area, sprayed it with water then foamed it. Once dry, sawed it level: It was JH put me onto Soudal products I think.

Okay, coming at this from a novice point of view, having never (yet) ducted an mvhr system. I would have assumed one could get (or make) an in line coupler to join two lengths of ducting together. then no need to work it out, just pull through until the roll runs out, insert coupler, start next roll, no waste. No I know why we don't do that with UFH as in line water connections that you can never get at are a bad idea. But an in line connection in an air pipe, that in many cases will be in a loft space etc where you can get at it does not sound like a bad idea at all. If in line couplers are not available I think I have just found a gap in the market.

You may benefit from using a low expansion ( LE ) foam. Don't forget to have some solvent gun cleaner to hand to clean any wet foam / overspill off. Do that immediately if required. Mask sensitive areas as the foam can expand and adhere to adjacent surfaces. Very hard to impossible to clean off certain things .

I think 315mm is the circumference. 315/Pi = 100

Our builder uses Everbuild stuff (primarily I think because he uses so much of the stuff). I'll double check the actual product tomorrow when I'm back on site.

Its not a holiday, it's visiting my wife's family!

Agreed, a regulation (perhaps well intentioned) which does nothing other than frustrate consumers who end up discarding the relevant part to get a decent flow. We tried an aerated shower head, reduced flow from 12 l/m to around 8 l/m. All that happened was you spent longer in the shower rinsing off soap / shampoo etc. Net result, less enjoyable shower experience and no water or energy saving. We ditched the aerated head...

I've recently fitted my MVHR ductwork (another BPC customer!). It's the first time I've used a radial system. Previous builds have used a mix of rigid and flexible main duct runs with individual rooms Tee'd off. I found the radial ductwork much, much easier to work with. I think the best tip is to having a cutting list. Work out / measure how long each of your duct runs is going to be so you can maximise the amount of usable duct from each roll. Case in point, BPC wanted to supply me with 4 rolls of duct. I worked out a cutting list at the point of order and reduced the number of rolls required down to 3. All I'm left with is a 1.4m length and 5 offcucts ranging between 300mm and 600mm.

It would have been an EU regulated fitting so you just bin the restrictor and replace it with a normal rubber washer, if required. Try taking a modern mixer tap spout apart and see how many different grade gauzes there are and how much they reduced the flow rate. They aerate the water too so it looks like there's more coming out, but when you fill a glass you see how little water is actually coming out. Fear not, Brexit wil take care of that .