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If you look back in the forum or do a search, there are lots of threads about orphaned miles.
I have no experience of Eurostar redemptions, but you can also convert them to hotel points (IHG or Hilton).
You will also find it is very easy to extend the life of the miles for another three years by buying the right sort of very cheap Virgin Trains tickets, (you don't even have to use them, from what I have read), or using the Virgin Atlantic 'Shops Away' portal -
http://www.virgin-atlantic.com/gb/en...hops-away.html
Nick