Yep.. definitely class 2.. think between about 10 - 12 quid a month.. also paid for a couple of missing years to get me to the 37 years.. but the difference it made to my pension forecast from the .gov.uk website was huge...when I get to 67 I will get the max amount (what ever it is then).. if you can do it, if you can find a way do it 100%.. the money you will pay out will be peanuts compared to what you get back from your pension if you live a good few years from your pension age...