I might be an outlier here, but I'd say with that level of budget, you'd be better spending around 2.5-3K on a decent 4080 with high refresh rate QHD screen laptop, put the other 2.5K aside and upgrade in a couple of years.
The 4080, as long as you get a decent machine with good TGP, should still be around desktop 4070-4070TI level, so on par or if not better than a desktop 3080, which'll push QHD framerates really nicely.
Then, upgrade a generation or two down the line; there's a rather huge amount of enthusiast tax at the top end, and given a laptop GPU is usually at LEAST a step down from the desktop equivalent so you'll get WAY more out of your money getting 2 high end machines that are a bit more mainstream (and sell a truck ton more and therefore have volume to get discounted a bit), over a couple of generations, than one ultra high end (with high enthusiast tax), which is very likely to get beaten soundly by the second machine you could get in a couple of years, now that AMD and Intel are at each others throats again.
Something like this. Unfortunately high end AMD gaming laptops are harder to find in the UK.
Order Acer Predator Helios 18 NVIDIA RTX 4080 32GB 18 WQXGA 240Hz Intel i9-14900HX Gaming Laptop now online and benefit from fast delivery.
www.overclockers.co.uk
If you're going to push the budget, something like this:
Order ASUS ROG Strix SCAR 17 NVIDIA RTX 4090 32GB 17.3 WQHD 240Hz AMD R9-7945HX3D Gaming Laptop now online and benefit from fast delivery.
www.overclockers.co.uk
3.3K and would happily last you, just make sure to install all the AMD stuff so the system puts games on the x3d vcache cores - its an added layer of complication, but it does come with a 4090 laptop GPU too.
I think if you look around, Asus do a few variants of these X3D AMD Gaming Rogs, I BELIEVE they got exclusivity on the x3D laptop chips last generation, but they're available with differing prices and specs from around the £2700 mark.
Honestly, I wouldn't spend more than the above 3.3K at most, put the rest aside for an upgrade in a few years