Actually on the subject of number plates, given my newly gained knowledge of the area codes, (thanks CitroJim!) I can add something mildly interesting and generally irrelevant -
Your 306 ends UAC = Coventry.
And by coincidence that the internet seems capable of generating, my first 306 was M325 OAC = Coventry!
Sadly the above is long since dead as far as the DVLA info suggests. I sold it cheap with a dead rear axle (trailing arm bearings gone) as thought it "too big of a job" to tackle myself - think it was subsequently fixed but only did one more MOT before disappearing off the radar.
Incidentally, that MOT history checker is useful and heart breaking in equal measure! (If a sentimental sod like me anyway) - can confirm that
every car I've ever owned managed
at most one further MOT beyond my ownership before disappearing.
