Roundtuit

Sorry, no experience of biodiversity credits, but in terms of the approved plans, it could be that the vendors planned a 'path of least resistance' through the planning process to avoid raising any eyebrows or ruffling the neighbours. We had a similar situation and did eventually get what we wanted through a new application (well, two apps actually, but that's another story).

I'd guess that the foundations for that supporting pillar could independent from the foundations of the rest of the house and the crack is a result of differential settlement. A bit of digging would soon find out if that's the case. The fix depends on whether it's still moving, and that's where you need expert advice. Maybe stitching the crack and patching the render would sort it out if it's stable, or underpinning the pillar first if not? Personally, I think it's potentially a negotiating point rather than deal breaker, but it depends on how much hassle it's worth to you. You may also find that lenders are more comfortable with 'historical settlement' than 'subsidence'.

Cable tie?

Is timber frame really 'non-standard'? No problem here getting a mortgage or home insurance on our timber frame. We do have a masonry outer skin though, so maybe that helps.

Just for clarity, I also hoover, but without constantly ramming my carefully fitted and painted skirting boards, so it is possible...

Ornate mouldings are not skirting boards though. Let's not forget that skirting boards fulfill the function of protecting the plaster at the wall-floor junction. My wife uses it as a bump-stop for the hoover.

Looks like an egg and dart pattern. I've only seen it on plaster mouldings rather than skirting.

If you can't see it on Google, then no. You can get standard profile pine or mdf skirting up to about 150mm, but anything above that will probably be made to order. Do you have a picture of what you're after?

I think they are generally made up from a number of separate pieces of timber and standard mouldings (quadrants, Scotia etc). I had some made to match Georgian originals.

I like glass, but maybe half of it. Dispensing with the dual aspect corner bits will simplify things and reduce structural complexity. You can still have the views, but through smaller apertures.

Same here. It took two applications, but we got what we wanted. If time is on your side, don't be afraid to revisit plans to suit you.

Vandersanden Flemish maybe?

Ours is outward opening, but composite with alu-clad frame from Rationel.

Ah... sorry, mis-read that. In that case your life will be much simpler!

Welcome, and congratulations! Old buildings can be a challenge, particularly when they're listed. I assume you realise you'll need Listed Building consent before you start anything significant; best to get your plans drawn up and submitted all in one application.