The full price for a 12 month Premium subscription at the moment is £199.99, so a 15% discount on that would mean subtracting £30, making the discounted price £169.99.
I don't know the answer to your other question, but my subscription expired on the 6th Jan, I received an offer to resubscribe with a 20% discount on the 9th Jan (I think that one was personal to me), and then the more general 40% discount offer appeared on the 25th Jan. The 40% offer ends on 31st Jan so if your sub expires after that it would be no use to you anyway, unless you can get customer support to give it to you. But if you let your sub expire, you might well get a better offer than 15%.
|