Crofter

That must depend on the product. I've got a set of French doors from them and they're definitely not completely airtight. They were cheap though, and they're on a pretty exposed elevation.

I'd be surprised if you could get 2G to outperform 3G without it ending up costing more. When I was recently shopping for new windows, I was offered a Krypton option and it pushed up the price much more than simply going to 3G.

I don't know about the English rules but AFAIK they should just specify a u value. Good 2G can be better than poor 3G. Not necessarily cheaper, though.

Ok that's much better. If your walls are already at 0.18 then improving the glazing will see a more substantial return because they are now the weak point, by far. People don't always realise that even the best windows money can buy will lose three times as much heat as a BRegs minimum wall. And cheap 2G will be up to uW 2.0 which is appalling. Everybody will find their own happy place on the cost/benefit curve, but personally I wouldn't ever aim for less than 1.4 as you should be able to find that for about the same price as the 1.6/1.8/2.0 crap. 1.1 is widely available at sensible prices. In my experience the prices only tend to rise markedly once you go below that.

1.8 is horrendous for a wall (you don't mean 0.18 do you?) but improving your existing walls is much harder than retrofitting better windows. None of this is rocket science. It comes down to surface area and u value.

They were imported from Poland. I got mine via a small outfit in Kirkcaldy, but @craigcan supply them too.

Same here. We've spent four out of the last five years living at anchor, using solar/lithium for cooking, and rainwater collection to supplement dock water. Hopefully we can get our recalcitrant watermaker running this year, we have plenty of power for it. We still have gas for cooking but it's strictly a backup option. Likewise, we can in theory charge the batteries from the engine, but the solar can put out six times as much power so we don't bother unless we're using the engine anyway. What makes this viable is that the boat isn't in the UK. Remove space and water heating from the equation and everything becomes much easier!

We've just taken delivery of a Neo sliding door. It was absolutely unbeatable for u value (0.74 uW) and was considerably cheaper than any aluclad iron. Haven't installed it yet but the quality looks good. Mine are dark grey on the outside, and as far as I can tell this is a solid colour rather than a foil wrap. I also took the option of having the glazing units delivered separately, which has made handling much easier. It will also allow me to install the frames by screwing straight through the frame. The glazed units were delivered in robust transport frames, unlike the cheaper units I bought from Modern UPVC Glazing. All in all, I'm quite impressed so far.

Floor: 300mm mineral wool Walls: 150mm wool+ 50mm PIR Warm pitched roof: 150mm wool+ 100mm PIR Plus airtight membrane battened and taped. Windows are 3G with u values of 1.0 or less.

Due to damage I've had to replace a couple of aluclad units, and have decided to go uPVC this time. I was able to improve from 0.98 to 0.74.

I think as you approach very low u values it's better to switch your attention to better airtightness detailing, because that's going to be where the bulk of your heat loss occurs. But it's not just about saving money. You're creating a comfortable house without damp, drafts, condensation, and mould. And it's extremely hard to improve insulation and airtightness later.

So just to conclude this, I finally made a decision. Went with the DHP490 drill and DTD153 impact, both a decent upgrade from the base models. Plus the 186 recip saw. Only added a single 3Ah battery, because once my tools are all reunited I'll have plenty of batteries. Powertoolmate won out in overall cost, there were only a few quid in it. If I'd wanted to, I could have split the order between two or three different places to get the absolute lowest prices, but I'd have lost out any savings in additional delivery charges. Looking forward to my new toys

I believe so, but it would get pretty frustrating waiting on them.

It's possible you ended up with the 'SD' charger, which looks similar, but has no fan.

This is the one I'm looking at, same as I already have. Definitely has a fan. https://cnspowertools.co.uk/makita-dc18rc-18v-lxt-li-ion-charger.html