Southeastern offering 10,000 train tickets for £5 each

Southeastern is offering 10,000 train tickets for £5 each to be used over a single weekend in April, a couple of weeks before Easter.
The £5 tickets will be valid for travel on Saturday 5th and Sunday 6th April across the Southeastern network, and will go on sale on Saturday 22 March via their website.
Southeastern’s network covers towns and cities such as Canterbury, Ashford, Maidstone, and Rochester, as well as scenic countryside and coastal destinations like Margate, Hasting