I will add that the other day I found out that (apparently) if your car fails its MOT, it is no longer considered road worth and is no longer insurable, and last year's MOT is no longer valid. The garage didn't seemed too bothered though, they just advised me to avoid the cameras...
Check what it says on the .gov website that's the only info that matters. IIRC I heard similar a few months back but nothing had changed according to the .gov site so I wrote it off as Chinese whispers although it may have been updated since then.