I'm not familiar with the different stores they have in the UK, so I searched on Amazon.co.uk and wasn't able to find much. But here's what I was able to find:
PC Specialist Omega Impact II Gaming Desktop (Black)
https://www.amazon.co.uk/Specialist-Omega-Impact-Gaming-Desktop/dp/B01M32CX5OPrice: £839.78
- Intel Core i5-6500
- NVIDIA GeForce GTX 1060 6GB Graphics
- 8 GB RAM
- 2 TB HDD
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PC Specialist Omega Impact IV Gaming Desktop - (Black)
https://www.amazon.co.uk/dp/B074H65M3FPrice: £778.72
- Intel Core i5-7500
- NVIDIA GeForce GTX 1060 6GB Graphics
- 8 GB DDR4 RAM
- 1 TB HDD
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Vibox Sniper 10XW Gaming PC
https://www.amazon.co.uk/Vibox-Sniper-10XW-Gaming-Warthunder/dp/B00JLMU2JWPrice: £999.99
- Intel i7 Quad Core Processor
- Nvidia Geforce GTX 970 Graphics Card
- 16GB RAM
- 120GB Solid State Drive and 2TB Hard Drive
I'm not sure what I'd go for out of these 3. Meaning which is best computer for the money.
All in all I'd go with the first one, as it's got a good video card, good amount of hard drive space and system memory.
The last one (Vibox) is kinda too costly in my option, as it only has a GTX970 graphics card. However, if you like this one best you can always upgrade the video card later.
That's what we usually do. Pick the best one, and then upgrade parts later if/when needed.
You may be able to find something of similar specs in your local electronic store.