Flash sale on Northern Rail train tickets

It’s not London (sorry!), but for those who are interested, there’s a flash sale on Northern Railway train tickets for journeys across much of the north of England.
(c) Northern
They’re offering up to 1 million adult Advance tickets with prices from just 50p per trip, and a further 4 million tickets are available for just £1 or £2.
Children’s tickets are available for 25p, 50p and 75p. Also, up to two children under the age of 5 years may travel free with