Dear Elise and Roy
We travelled back from Corfu last Friday. At check in our hand luggage were not even looked at and our cases were overweight. There was no problem. Two weeks earlier at Gatwick, our cases had also been overweight, again no problem, bags not even looked at! I guess if you were trying to take something outrageously big or of an awkward size then you may be questioned, but I seriously don't think that an extra 2 cm will be an issue. We were lucky not to be asked for payment for overweight luggage, I know that, but I think they have more serious problems to think of at the moment.
Have a great holiday