Might be old news to some of you, but I learned today that they are replacing the current MOT certificates as of next month.
The new one will be as it is now, however it'll be printed on white paper as opposed to the current green / yellow / red system. Also, they will be printing advisories on the reverse side of the paper.
Personally I quite like this new system. Shady sellers will no longer be able to hide long lists of advisories waiting to surprise you.