How do you get the cheapest euros star train from Paris to London?

Ticket prices vary according to season, time of day, school holidays and other factors. This applies to ferries and airlines as well; unfortunately it seems impossible nowadays to ask when the cheapest tickets are available and book at those times. Luckily, however, on Eurostar.com it is possible to click a 'my dates are flexible' box and find prices for three days either side of the date specified. For the week of 13-19 June, for example, tickets can cost from 80€ to 150€.

It is also worthwhile trawling agency websites, as there are sometimes bargains to be had from such sites as Expedia, Opodo, Lastminute etc.