Do I have enough ?

Adyinvestment

My rough maths makes it you have enough to last you until 137 years old without risking/investing any of it, this is not including inflation.

This is assuming 20k a year with the figures given (including the 100K spent on housing)

This does not count for inflation (or savings account interest) but does seem to indicate that unless science has some amazing discoveries you have very little to worry about.


**Edit**
Sorry, I didn't allow for the DB pension on top of the state pension from 67...taking this into account you have enough to last you until age age 193 (although I would imagine inflation would have a serios impact on this over the next 134 years!)

I think you will be fine 

Adyinvestment

To add to the above, as long as the government stick to the triple lock from age 67 you are only concerned about the inflation on £9500 each year.