Unfortunately, the UK did away with its Retired Persons of Independent Means visa some time ago, and with only a 2k/month USD income and no intention of working, the UK doesn't have any visas that you would qualify for. They would definitely not offer subsidised housing to a foreign pensioner. The movies make it seem really easy to up and move to a different country, but the fact is that it's quite difficult. Without a job, a huge amount of money to invest, or a UKC spouse, there's really no way for an American to settle here.