Take advantage of the pension carry forward rules in order to benefit from any unused allowances from the previous three tax years. This is generally the difference between the old £50,000 limit and the pension input each year and can be added to your relief for 2014/15. Note that the annual pension allowance is £40,000 from 6 April 2015.
For example if your pension input was £20,000 in the 2011/12 tax year, then there is potentially up to £30,000 unused relief from that year available to add to your £40,000 2014/15 pension allowance. You would need to make gross pension contributions of at least £70,000 (£40,000 plus £30,000) to avoid losing this generous relief.