Instructions:This was in Sunday Mirror, I tried this on a few dates ( July/ Aug ) and seems to work, discounts anything from £20 to £50 pp.,but bigger discount might be available for other dates.
As does'nt seem to give you the exact percentage of discount in description.
Departures from Glasgow only.
example in newspaper
Glasgow to Crete 12 August 14 nights Happy days studios s/c with 2 sharing was £625 now £335
It does give you a phone number to try for other dates etc. 08712262088,although you would be cheaper trying online,as saving on phone call etc.
I'm afraid this is a case of search for the best dates for you and try code,might help someone.