I missed the programme, so can't comment on the characters - it will be interesting to see how it develops.
Our second son lives there, and I've visited twice. They're up in the mountains in the SE. The Indian people I met were lovely, and they seem to have a similar sense of humour to the British. All those I met spoke english.
But the climate is difficult - apart from the heat, many areas have the monsoons, nonstop rain for weeks.
And the class differences I found upsetting - a level of poverty we have no concept of in the West. About the level of the Calais "jungle."
Personally I wouldn't want to retire there - son has said we could come and live with them, but they have no room, and it's very "different."
But I would love to go back.