21 wrote PCPartPicker Part List

CPU: AMD Ryzen 7 3700X 3.6 GHz 8-Core Processor (£314.95 @ AWD-IT)
Motherboard: Asus TUF GAMING X570-PLUS ATX AM4 Motherboard (£206.59 @ Aria PC)
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory (£74.49 @ Aria PC)
Storage: Intel 660p Series 1.02 TB M.2-2280 NVME Solid State Drive (£97.03 @ CCL Computers)
Video Card: MSI GeForce RTX 2070 SUPER 8 GB GAMING X TRIO Video Card (£563.47 @ Ebuyer)
Case: Cooler Master MasterBox NR600 (w/o ODD) ATX Mid Tower Case (£69.99 @ Box Limited)
Power Supply: SeaSonic FOCUS Plus Gold 550 W 80+ Gold Certified Fully Modular ATX Power Supply (£72.45 @ CCL Computers)
Keyboard: Corsair K70 RGB RAPIDFIRE Wired Gaming Keyboard (£95.47 @ Scan.co.uk)
Total: £1494.44

Can get the K70 with MX Reds or MX Browns instead of the MX Speeds if you like.
Add whatever capacity HDD you want/need.
There are cheaper RTX 2070 Super's if you want to save a little bit of cash there, Gigabyte and EVGA have some closer to £500 I think.
Mouse is entirely subjective, so I'll leave that up to yourself.
I'd probably add an aftermarket cooler, but can do that at a later date if it's easier. Be Quiet! Dark Rock 4 or Dark Rock Pro 4 would be my choices.

For monitor, I'd be looking at this;
currys.co.uk/gbuk/computing/pc-mo...6-pdt.html

If that's too expensive, or you don't want an ultrawide, then this;
currys.co.uk/gbuk/computing/pc-mo...lsrc=aw.re
(although this has just come up £50 today)

21 wrote You could up the CPU to a Ryzen 9 3900x if you wanted, but I wouldn't bother unless you're actually going to utilise the extra cores/threads.

You could up the 2070 Super to an RTX 2080 Super or 2080Ti, but you get diminishing returns pretty badly after the 2070 Super.

Honestly, any more money I had would be first put towards cooling(aftermarket CPU cooler, case fans), maybe a more expensive case, storage, and then dress up the system with cable extensions and/or RGB LEDs, etc.

21 wrote You could up the CPU to a Ryzen 9 3900x if you wanted, but I wouldn't bother unless you're actually going to utilise the extra cores/threads.

You could up the 2070 Super to an RTX 2080 Super or 2080Ti, but you get diminishing returns pretty badly after the 2070 Super.

Honestly, any more money I had would be first put towards cooling(aftermarket CPU cooler, case fans), maybe a more expensive case, storage, and then dress up the system with cable extensions and/or RGB LEDs, etc.

21 wrote PCPartPicker Part List

CPU: AMD Ryzen 7 3700X 3.6 GHz 8-Core Processor (£314.95 @ AWD-IT)
CPU Cooler: be quiet! Dark Rock Pro 4 50.5 CFM CPU Cooler (£69.98 @ CCL Computers)
Motherboard: Asus TUF GAMING X570-PLUS ATX AM4 Motherboard (£206.99 @ Aria PC)
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory (£74.49 @ Aria PC)
Storage: Intel 660p Series 2.048 TB M.2-2280 NVME Solid State Drive (£191.40 @ CCL Computers)
Storage: Toshiba P300 3 TB 3.5" 7200RPM Internal Hard Drive (£65.09 @ CCL Computers)
Video Card: MSI GeForce RTX 2080 SUPER 8 GB GAMING X TRIO Video Card (£739.99 @ CCL Computers)
Case: Phanteks ECLIPSE P600S ATX Mid Tower Case (£124.98 @ AWD-IT)
Power Supply: SeaSonic FOCUS Plus Gold 550 W 80+ Gold Certified Fully Modular ATX Power Supply (£72.77 @ CCL Computers)
Case Fan: be quiet! SilentWings 3 PWM High-Speed 77.57 CFM 140 mm Fan (£17.92 @ Laptops Direct)
Case Fan: be quiet! SilentWings 3 PWM High-Speed 77.57 CFM 140 mm Fan (£17.92 @ Laptops Direct)
Case Fan: be quiet! SilentWings 3 PWM High-Speed 77.57 CFM 140 mm Fan (£17.92 @ Laptops Direct)
Keyboard: Corsair K70 RGB RAPIDFIRE Wired Gaming Keyboard (£95.47 @ Scan.co.uk)
Total: £2009.87

That'll be about £2500 once you add a mouse and the ultrawide monitor I recommended.

So I've upped the GPU to a 2080 Super- up to you if you'd rather spend the extra £200 for this, or just get an RTX 2070 Super. I also added an HDD and larger SSD, added an aftermarket cooler and a couple of good case fans too.

Swapped the case for an Eclipse P600S, that's probably what I'd personally get if I was getting any case regardless of price. The Cooler Master NR600 is a great case though, and a great price. The Fractal Design Meshify C is another great case, under 100 quid too.

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If you want to dress the system up, you can buy an RGB LED strip. You can also buy Phanteks Halos RGB fan frames;
overclockers.co.uk/phanteks-halos...74-pt.html

Also, Overclockers and Amazon have a wide selection of cable extensions in a variety of colours and styles.

21 wrote You could up the CPU to a Ryzen 9 3900x if you wanted, but I wouldn't bother unless you're actually going to utilise the extra cores/threads.

You could up the 2070 Super to an RTX 2080 Super or 2080Ti, but you get diminishing returns pretty badly after the 2070 Super.

Honestly, any more money I had would be first put towards cooling(aftermarket CPU cooler, case fans), maybe a more expensive case, storage, and then dress up the system with cable extensions and/or RGB LEDs, etc.