Book by 9 January and fly by 31 March. The offer is for Executive Club members only (log-in required) and shows when you get to the ‘total price’ page rather than showing a big red ‘D’ next to sector prices like it used to.
If you need to switch between pricing up ET and CE itineraries or vice versa, then you can force the discount using the codes SKIJAN12ET for Euro Traveller fares and SKIJAN12CE for Club Europe ones.
At the moment, I can only get the Club Europe (well, Business in context) code to work for flights out of London City. The Euro Traveller/Economy one doesn’t seem to be working exLCY currently.
Full Ts& Cs (ignore the one-time use and household account references, which don’t seem relevant to this particular offer):