Iceverge

Commercial flying is mass transport and ballpark similar to an ICE car with one person on board in terms of CO2/Km . It's just that someone rarely drives the equivalent distances. You could probably half CO2 of airliners by having a large and much slower turboprop aircraft but the idea of taking 24hrs in an economy seat to get to New York won't make you many friend's among the travelling public.

Get up there with a penknife and poke at the timbers. The chances are that if it's survived so far it'll be fine long term. If you buy I'd upgrade the bathroom fans to dMev to ensure moisture gets extracted at source. If you upgrade attic insulation it'd be worth sealing all penetrations in the ceilings to, to limit the amount of humid internal air making it's way into the attic as the he more insulation in there the colder the rafters and sheathing will be.

It's the seals. Brush and sliding seals just don't work anywhere as well as compression seals.

A laser level head and sole plate and stand them studs between them. Shims behind and concrete screw through the studs to the brick wall intermittently to brace it. A parge coat will dry very quickly. You could do it straight away.

10mm should be fine for everything other than baths and showers. 15mm to the kitchen sink if you want to recreate a waterpark. 10mm is fine otherwise in my experience

https://www.proair.ie/products/proair-pa600li-2/ That's the one. I just took it apart and cleaned it and pulled out the fans and found some you tube vids to take them apart. The bearings are a common item. No rocket science. Ebmpapst make most of the fan units so something like this will show you.

I think that was @DannyT restricted to 350mm. Maybe OP is too. I would just do a 200mm cavity with stainless ties and 036 batts. Should be able to pick them up for £15/m2 for 2 x 100mm. Or 175mm and EPS bonded beads.

I'm glad you've found a good company. That's probably more important than anything. I know I'm banging a PVC drum here but I see they do Veka profiles. I would price Alphaline 90 and Softline 82 and go to see a house with them and alucald both installed after 10 years and compare. You could see a £30k swing the other direction and a lower maintenance better performing window.

Apologies for my hiberno slang. Just glancing at the section of the window I wouldn't be sure it was a top performer in terms of air sealing and thermal conductivity. I would like to see more seals and insulation. Something like this with 4 seals and thermally broken too. The Uw figure looks fine as a whole but just be cautious of it as large areas of glazing with a low Ug can hide poorer Uf figures.

Those frames don't look hectic. What's the Uf value?

Wider cavity. It's not rocket science. We have 250mm.

Where's North?

I have a basic cheap flymo from about 10 years ago. It works fine on a flat lawn. I never bothered switching it off. Let it run all winter in the old house. I never got around to installing it in new build. It will get stuck in any hole bigger than a cup. One thing to be careful of is the mowing height. Too low and the grass will get weak and the leather jackets will have a field day.

Preach.

Nope, it's about 60% dearer than the readymix lorry. The cheapest way to get concrete is from the mixer truck..