I did the same, losing about £1k a year. However, the whole lot being taxed at 40% on top of my new salary, I ended up losing £50 per month. My income after leaving is substantially more than I would have made staying in. Also while you are still serving you are not being paid any pension at all. So in my case a win but you have to look at the big picture to make an informed decision. Spending some time on a spreadheet playing with the numbers helps.
regards
retard