Your client estimates that they will require £50,000 of income annually to live off when...

Your client estimates that they will require £50,000 of income annually to live off when they retire. Personal plus state pension will provide £40,000. They wish to retire in 25 years’ time. It is estimated that they can earn 5% per annum, and inflation has been forecast at 2%. Interest rates are currently 1.5%. Allowing for inflation, what lump sum would they need to accrue to supplement their pension?