In reply to kipper12:
As another non-Port suggestion, I'm very partial to a glass of Madeira. For good quality Madeira, look for the words Malmsey (or Malvasia) or Bual - these are the classic grape varieties. Malmsey is the sweetest, but I prefer Bual, which is still very rich, but with the sweetness cut by a really clean tasting acidity. A ten year old Bual from Blandy's or Henriques & Henriques should cost about £20 (I see Waitrose is doing a 15 yr old for £25, albeit a 50 cl bottle).
Vintage Madeira isn't seen that often but it's sublime if you can find it (I found a 1993 Bual in a wine merchant in Birmingham a year or so ago, and it was excellent); I think it's a good general rule that at any given price point a Madeira is better than the corresponding Port.