Hi Jan
Thanks for the warning, I'll make sure we don't overpack our suitcase then.
I travelled with Easyjet a month ago from Newcastle to Murcia and they were trying to check the sizes of the luggage then however, it turned out to be an absolute shambles. Many of the people who had paid for the Speedy Boarding had been held up while their luggage was checked but the staff soon got bogged down and everyone else marched through. On the way back, I checked my luggage before entering departures at Murcia airport just to make sure it was the correct size. This time they took my boarding card off me until I had my luggage checked. Again the queue got backed up after a few people so they stopped checking and the woman behind me managed to get on the plane with 3 bags.
I will warn you to check the sizes of your luggage though. Both Easyjet and Jet2 advertise on their websites that they accept hand luggage of 56cm but if you check in online the boarding passes state 50cm and it's that which they use.