In reply to 001HELEN:
When I flew with Ryanair I just checked my pad in as normal check in luggage, I'd printed off the weight and dimension restrictions for checked in luggage in case I was challenged but I had no trouble. A quick look on the jet2 website wasn't very helpful, they have plenty of stuff about weight restrictions but nothing about dimensions. Might be worth emailing them to get in writing the maximum dimensions of checked in luggage