Were you not based somewhere near the Lakes? That gives you a vast range of shops with stock to look at and spin round the car park:
Wheelbase, Biketreks, KMB, Push Cartel, Simpson Frameworks, Ghyllside, Giant store etc.
Then a short hop down the M6 to Hewitt, Merlin, Ribble, Kuota, Dolan and countless others.
PS discs aren't going to help much if you are barrelling into corners or junctions without consideration for what you can and can't see - with a road bike it's the tyre grip that's the limiting factor - never had an issue with rim brakes.
No not bothered about 'show-offy' at all because I ride alone and don't tend to stop and if I did I'd rather not chat to people but equally I want something I look at and think 'that's nice' so I dont want anything boring black, racing green, royal blue. For that reason I agree with @anagallis_arvensis that the Liv's look IMO far better than the giant. I like on a road bike the fact I can wear and happily do, bright yellow jerseys, things with polka dots on them, bright calf high socks! I'd like the bike to look ace! Trouble with Time is I need whatever bike to be available on 0% which I dont think a custom bike will be.
Personally if I had a reasonable wedge to spend I would buy a specialized aethos. Also bearing your comment above in mind, they seem quite classy without being bling and exotic enough to have people striking up conversations with you when you roll up at the local cafe.
https://www.sigmasports.com/item/Trek/Domane-SL-6-eTap-Disc-Road-Bike-Gen-4-2023/Z9IK
Some change left for some nice wheels?
As mentioned above Elves might be worth a look, one of the ladies in my club, a fairly handy racer, wrote;
“I’m very lucky to have my first ever from new aero bike…
I was obviously a bit nervous going with an unknown brand in the UK but I’ve been genuinely blown away by the bike. I raced it on Sunday in a very high quality Nat B field, and firstly caught a fair few riders by surprise with the speed I was descending at (new top all time speed according to Strava), then how much I was gaining on corners, and despite me still not being back at full fitness (weight up, watts down) they couldn’t drop me on the hill. So one very happy customer here, and I haven’t even mentioned how beautiful it is, all the different colours it becomes as the light changes, and how comfortable I’m finding it.”
Her build was about 4k
Enigma titanium, with some nice anodised finishing. My advice is always to buy something orthogonal to what you already have, because replicates mean one won't get ridden. Since you're not doing hills, I'd also second a lovely steel 953 frame too (weight penalty is a decent bottle of water), but nice things come to those who wait. You can have a full aero cable-free cockpit, electric shifting and of course disks too. And you'll get a lot more appreciative glances. Pride of ownership for my recent Enigma (fixed wheel, full Record) is even higher than my Defy Advanced SL (cable Dura Ace, rim brakes), and I love the latter a LOT!
Shiny https://www.enigmabikes.com/products/excel-frame
He’s a bit nuts, but worth watching some of these 😉
https://m.youtube.com/watch?v=pxr1XVrDYys&pp=ygULRHVyaWFucmlkZXI%3D
https://m.youtube.com/watch?v=zmVXEIapEKY&pp=ygULZHVyaWFucmlkZXI%3D
@TiRed, I was going to suggest something similar, a Reilly Fusion, but even without any fancy anodising you would be looking at £8k minimum, more if you went for anything better than Ultegra. 
So I stuck to the Liv, saving nearly £4k to spend on beer. Winning.
Can’t go far wrong with a tarmac. I have the sworks version but the ‘poverty spec’ normal one will be just as good for half the price.
spesh also have phenomenal customer service.
anything from canyon will also be lovely, and far better value for money. Giant are great bikes, currently have 3, but I’ll never buy another based on not only that warranty thread, but also my personal exp of helping out a customer (or not in my case)
I have to say that the 'elves' bike posted a little higher up is the ugliest bike ive seen in a long time.
I appreciate beauty is in the eye of the beholder, but that glowing testamonial must be from someone heavily supported surely?
Spoke to Paul @ Mapdec ( I go to their gym )
he said he’s planning on offering 0% next year if you can wait?
That's good to know as I'd been planning on waiting until next year either way.
