OK Marc, here is the good news and the bad news.
On the good news side, that is more than enough money to buy a really good bottle of 1986 Bordeaux.
For the bad news, you need to find a bottle from a merchant in the UK that sells single bottles and that can guarantee good provenance, IE, storage. Bottles in poor shape will offer a poor tasting experience.
You should read this article: http://www.thewinecellarinsider.com/win ... ips-wines/
In your price range, (I think) but close to the top of your range is 1986 Gruaud Larose. It's a stunning wine. There are others, but 1986 is a tricky year. On the bright side, many wines are long lived. On the not so bright side, most of the wines are hard and charmless, which does not make for a good experience.
Look around, read my site and feel free to ask more questions that will help you purchase a really nice, 30 year old bottle of wine.