For every one-way adult ticket you purchase for travel in August you can get up to two child (aged 4-11) one-ways for £1.
This is an excellent offer as a child returns normally starts at £49!
Book 16-21 July for travel in August. Valid on routes form London St Pancras to Paris, Brussels or Lille.
To make it even better value, the Euro has never been so good, we are currently seeing a rate busting 1.2465 euros for £1 from Travel FX and The Currency Club – compare all rates here.