Hello K,
As a guide, here are some examples of UK prices
Typically, iPhone 5s, iPhone 5c, iPhone 5 SE, and iPhone 6, are currently - £ 136.44 And … iPhones, 6 plus, 6s, iPhone 7 and iPhone 8 are currently - £156.44 These prices include UK VAT and a shipping fee of £7.44.
The full UK price list is included here ... https://support.apple.com/en-gb/iphone/repair/service/pricing which includes guidance on lower prices for screen and other accidental damage if you hold AppleCare+.