Leave from Manchester on November 11th and return on 15th April. Twenty two and a half weeks!
No concrete plans yet but I'm hoping it to be something like..
4 weeks or so in Goa to 'acclimatise'

Up to Delhi, Agra, region for a little while and down to Varanasi.
Up into Nepal for a few days in Kathmandu.
Try and be in Bhopal on Dec 3rd for their sad 25th anniversary of the disaster.
Back in Goa after New Year to meet up with son and daughter Jan 11th.
End of Jan off down to Kerala round to Chennai or the opposite way round
Maybe if funds allow, over to the Andaman & Nicobar Islands or the Lakshadweep Islands (prob skint by then)
Back up to Goa to end it with a couple of weeks relaxing.
I'm sure this is gonna change almost daily the more I read on all the India travel forums

I think I'm bonkers but if I don't do it now.... I may never
