Just to answer your question:
They are standard UK prefix plates. The AEX part identifies the area the car was initially registered and if you search just AEX in the forum a plethora of owners registrations will pop up.
The C prefix determines the year 1985-1986 as prefix A began in year 1983-1984, with the prefix letter changing each new year in sequence, skipping letters resembling numbers - O-I-Z-U(Too close to V)-Q to assist the cops chasing the speeders.
The previous sequence 1963 - 1983 had the single letter at the end as a Suffix.
These 2 sequences each had a finite life span of 21 years so as they began to run out in 2001 the sequence changed to include 2 numerical combinations half yearly to assist the car industry selling new reg's to materialistic suckers who must have the newest car on the street. Current sequence has 2 letters 2 numbers 3 letters, where the numbers are linked to the year - examples 2013 = 13 & 63 (13 + 50); 2014 = 14 & 64 (14 + 50) and so on. This sequence will last for 50 years or until we run out of fossil fuel and go back to donkeys or Fords

Nothing is fool proof. Fools are clever!