If you take Eurostar from Paris to London St Pancras you may buy the correct paper Travelcards at the First Capital Connect booking office, but if not then Victoria station it will have to be.

In the past there have been plenty of leaflets detailing the offers at Victoria, both in stands at the ticket windows and in the rack near windows 13 and 14. A few weeks ago I had a look, though, and didn't see any which was most unlike Victoria which usually has lots of them. May have been gone with no top up as the offers were to expire at the end of the month (today).

If you do see the leaflets, each has three pre-printed vouchers in a fold out page at the back, very handy.