The amount of extra income depends on your personal situation - I have written a web page - see https://www.williamburrows.co.uk/retirement-options/about-annuities/enhanced-annuities/
There is a useful chart which I have just done so do take a look - the following is an extract from the page
An enhanced or impaired life annuity pays a higher income because an allowance is made for any medical conditions which might reduce life expectancy You will probably qualify for an enhanced annuity if you can answer yes to one of the following questions: Do you smoke? Are you taking prescription medication? Have you been to hospital recently for a medical condition?
