I'm a US citizen, male, age 58, retired,
very low income, no pension transferable
outside USA.
How can I legally enter and remain in England?

I browsed the UK immigration site,

you might want to start with this,

http://www.ukvisas.gov.uk/servlet/Front?pagename=OpenMarket/Xcelerate/ShowPage&c=Page&cid=1006977149962

Your will probably have to fill out a visa application. Do you have
family in the UK, anything that will show connection to the country
will be helpful in a successful application. Also try to show that you
have something to offer, what did you use to do for a living?

1. Book flight to Paris
2. Take train Paris > Calais
3. Jump inside lorry on route to UK. [Hide well and try not to breathe]
4. Get out of lorry.
5. Repeat over and over "P O L I T I C A L  A S Y L U M". Do this in a
heavy fake accent. Remember: Practice makes perfect!
6. Find youself being given : Anything and Everything...for
free....gratis...no question..

Got to legal...Everyone else is doing it!

Good luck and bon voyage;