Totally confused now with which credit card to go for lol!
It doesn't really matter if you intend to pay it off every month in full and not deviate from this.
Here are some recommendations from me.
Nationwide Classic Mastercard - Register an electrical item within 60 days and get an extended warranty. It does exclude stuff like iPhones, though. Read the small print then you wont offer to buy the girlfriend an iPhone on your card because it'll get a super warranty like I did

Halifax Clarity - Best possible card for foreign spending.
BMI Amex card - if you spend a certain amount - I think its 500 quid - within 3 months, you get enough BMI frequent flyer miles to qualify for a free return flight (Though you pay taxes). CHECK THE SMALL PRINT as Amex tends to be a pain to get and probably has a salary requirement.