Instructions:I have just used this code and it worked for me.
Pretty good deal- 2 months free, cancel a few days before, then reactivate with a 3 months for the price of one voucher!
in total 5 months for the price of 1!
( when you put this code in, it doesnt tell you straight away if it worked, only till you choose what package you would like a couple of steps later. I used this code using google chrome.)