Now, there's the glitch where the new scheme works in your favour.
If you retire at 54 yrs and 11 months, you get a 75% pension for 10 yrs, but you also get 2 large, tax free lump sums (1 immediately, 1 at 65), then 100% pension at 65. Take into account tax etc, balance it against living until your 65th birthday, and you should be quite considerably better off!!
Try putting the figures into the pensions calculator, it's very interesting.