You'll have to trade many portraits of Her Majesty to grab an iPhone 8. Carphone Warehouse has a slightly better deal than the £700 that Apple charges - you can get the 64GB phone for £660 and a one-month contract on Vodafone, O2 or EE. That single month will cost you between £14.5 and £17. You don't get much data or call time, but you can switch to a better plan in 30 days. Keep in mind that most subsidized deals for the iPhone 8 typically ask for £50 a month for two years, so you'll get over the £700 SIM free price pretty quickly. If you're interested in more storage, the 256GB...
Source: http://www.gsmarena.com/deal_save_a_few_pounds_off_an_iphone_8_or_8_plus-news-27352.php