Use a VPN service (see my comment elsewhere on this page), register for the American service, and then, on the VPN service's website, change your Netflix region to UK or another region.
For those looking for a solution that will allow them to watch e.g. the American version of Netflix (which has the largest selection), check out https://unlocator.com/ or http://www.unblock-us.com/. The latter was a bit unreliable for me, whereas the former works well.
To save money, create an American Netflix account instead of a Netflix account in your native country. The way to sign up for the American account is to use one of the VPN services above, change your DNS settings as explained on the VPN service's website, and then go to netflix.com. You should then see the American version and be able to create an account there.