There's a cap on the total value of all your pensions, which is currently £1.8 million. If the value of your pensions (including those in payment) exceeds the Lifetime Allowance when you take benefits or reach 75, you’re likely to incur a tax charge on the excess. The Lifetime Allowance is set to fall to £1.5 million in April 2012, but there will be provision to protect those who were relying on the Lifetime Allowance being £1.8 million.
Important information - The pension and tax rules are subject to change by the government. Tax reliefs and state benefits referred to are those currently applying. Their value depends on your individual circumstances.