I was looking for flights to Gran Canaria on the 23rd of Dec returning on the 28th.
An adult return from London was about 230 quid but booking a flight from Manchester cost me just 70 quid return!
Booked for a family of 4 and that worked out 270 quid plus the parking at the airport for £36. Saved me about 600 quid in total!
Hope this helps someone :-)
They don't even fly run Gran Canaria on the 28th!