I was in debenhams last night, and they are doing the 125ml for the same price as the 75ml. You also get a free Diesel belt.
combined with the £5 voucherhttp://w.shopdebenhams.com/nms/jsp/webForm.jsp?fo=VoucherOther
you can get it for a little less online, as its 15% discount, but no free belt, and im not sure about delivery.
I really like it, and not bad for an xmas present.