Unfortunately the straight conversion from USD to GBP does not work (at least, not always).
Compare the price difference of the cheapest 980 TI available in the US, that's also available in the UK:
PCPartPicker part list /
Price breakdown by merchant
Video Card: Zotac GeForce GTX 980 Ti 6GB AMP! Video Card ($529.99 @ Newegg)
Total: $529.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-05-16 16:08 EDT-0400
$530USD should be available for 368GBP on a straight conversion, right? Wrong.
PCPartPicker part list /
Price breakdown by merchant
Video Card: Zotac GeForce GTX 980 Ti 6GB AMP! Video Card (£539.99 @ Amazon UK)
Total: £539.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-05-16 21:10 BST+0100
That's the equivalent of $777 USD
Even the cheapest 980 TI available in the UK is still the equivalent of $720US
PCPartPicker part list /
Price breakdown by merchant
Video Card: EVGA GeForce GTX 980 Ti 6GB Superclocked Video Card (£499.99 @ Amazon UK)
Total: £499.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-05-16 21:11 BST+0100
Based on that kind of pricing/marketing alone, cards sell for somewhere in the region of ~35% higher in the UK.
$599 USD for a 'normal' card + 35% = $808 USD which is roughly 560GBP
Founders edition $699 USD for a 'normal' card + 35% = $943USD which is roughly 650GBP.
All speculation of course, but i'd be 99.99% sure you won't see a 1080 priced remotely close to it's US counterpart.
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