East Coast Mainline have offer which requires booking by tomorrow (09/01) for travel 17Jan-28Mar
£5ew London-Yorkshire, £10ew London-NE, £15ew London-Edinburgh (or vice versa travel) depending on availability.
Outbounds on Saturday morning (heading North) seem particularly difficult, but if anyone were to propose a sneaky interim PG weekday descent on, say, A&H in Wakefield, at a tenner i'd check me diary.
http://www.eastcoast.co.uk/january