Eurostar from London to Paris, Lille, Calais or Brussels (and vice versa) for £59 return *UPDATE*
Eurostar is offering 150,000 return tickets for only £59 or €79 per person from London to Brussels , Lille or Paris and vice versa. The regular price is up to £20 higher.
Update: If you book your tickets on Raileurope.co.uk you can also book return tickets to Lille and Calais for £59. If you want to travel further than Brussels, you can book a ticket to any Belgian Station for £69 return.
There are 60,000 seats available at this price to Brussels and 90,000 seats to Paris. As you can see, seats are limited so don't hesitate to long if you're interested in this promotion. If you travel from London, the train departs from London St Pancras, Ashford or Ebbsfleet International to Paris, Lille or Brussels.
The promotion is valid fo travel from 17th January to 27th March 2013 (excluding 14 – 24 February 2013) in Standard Class. You have to book by 14th January 2013.