Steve your black MG.....If you pass it again just check to see if its a Triumph
Here's my reasoning. The Reg No. MBH604E not found on DVLA records....
Doesn't say the model but if it looks like an MG ie a sportscar, then it would have to be a GT6 which at 80 MPH on the other side of the road could be easily be mistaken for a MGB GT.Warning....This is a nerdy bit. It's probably unnecessary to read it. Skip to the punchline if required.
BH suffix is Buckinghamshire. The preceding M is a sequential item so you would go from MBH 001 to MBH 999 then it would turn into NBH 001 to NBH 999, and on and on.
The significance of this is that the letters and numbers of the registration plate also translate into a year of issue.
This chart from oldclassiccar outlines the sequence for the BH (Buckinghamshire)
This would confirm that "E" only comes in for Buckinghamshire (BH) registration plates from TBH onwards. All Buckinghamshire (BH) regs for MBH would be "D-Reg".
Assuming that the "E-Reg" you spotted is correct, I would suspect that you may have, at a combined speed of 80 mph! mistook WBH for MBH.
So what do you get when you put in WBH604E into the DVLA Vehicle Check
This 1967 Triumph 1998 cc Black with a current MOT