On overnight reflection, a deferral might assist in reducing your annual income, but your pension provider would have to agree to this procedure. Were this income through an annuity then I regret that such an approach won't work. There is also the danger that nay deferred sum would be lot altogether from your estate on death.
You have to remember that you have to actually receive income to be taxed thereon. When I first studied tax the Investment Income Surcharge was imposed when Dennis Healey was Chancellor to the Wilson Government which taxed unearned income at 95%, ouch. It wasn't so long ago that the basic rate of tax was 35% and husband's and wife's incomes combined!