Eurostar Frequent Traveller start expiring 30 Sep 16
 

Just in case anyone didn't get the email:

EFT points have always had a three-year life according to the T&Cs, but up until now they haven't expired. However, with a systems upgrade, any out-of-date points will expire on 30 Sep 2016. You only have to make the booking by 30 Sep, you can travel after that date as long as you have made the booking.

Thereafter (Eurostar says) points will expire three years after earning them, which is a bit annoying, as you'll need to dig in to your account to see what you earned in late 2013.