I'm looking to retire to sunnier climes too. India is a brave choice (spotted the pun, but wrong type of Indian), would need to do your research on that one - especially healthcare.
Last time I went anywhere near London/SE was 2007, when I had to get the train up to The Smoke to get out to Strood to collect my van. Can't see I would ever go back unless I had to. Stanstead is poss the closest I would get in the future. Got my cousin's daughter from South Africa working in Wandsworth at present. Tried to dissuade her from London, but she wanted the bright lights. At least being from SA, she's wary of the problem and will feel right at home. Been there 6 months and hoping to meet an English person. Her sister coming over for hol and asking if I'll visit.
Told her I felt safer in Jo'burg. They'll have to come to me.