If you sign up for Netflix via their Mexico page (https://www.netflix.com/mx-en/) you can get the standard package (2 screens + hd) for 129MX$ per month which depending on the month is about £5.65* compared to the UK price of £7.49. I've used this method for over a year and you will have full access to the UK catalogue.
* this was the price I paid this month and includes card conversion fees.
Note: I used a VPN set to Mexico to ensure Netflix didn't default to UK pricing. I haven't tried signing up via the above link without the VPN. I haven't checked whether this is against their ToS.