All sorts of official and unusual vehicles running round incognito, i doubt anyone unofficial would be daft enough to fit blue lights to their private car and use them on the road.

Could be anyone from Fire Chief to protection officers.

Unmarked vehicles need no other lights than the blue flashing ones.

It could be any one of these:-

Emergency Vehicle Definition

An emergency vehicle is classed as a vehicle used:

• for police purposes (but not necessarily a police vehicle, e.g. search and rescue)
• for fire brigade purposes (but not necessarily a fire brigade vehicle)
• for ambulance purposes (but not necessarily an ambulance vehicle, e.g. cave rescue)
• as an ambulance for moving sick, injured or disabled people
• by a specialist company for fire salvage work
• by the Forestry Commission for fire fighting
• by local councils for fire fighting
• for bomb disposal
• for nuclear accidents
• by the RAF mountain rescue
• by the National Blood Service
• by HM Coastguard
• for mine rescue
• by the RNLI for launching lifeboats
• for moving around human organs
• by Revenue and Customs for serious crime
• for mountain rescue purposes
• by the military special forces (e.g. The SAS) for a national security emergency

Yes, it would have been MT or ML

M165 CUA would be too old to be a 508: ML or MT perhaps? Either way that's a Manchester registration, so their police shouldn't be weaving in out of traffic on the M25.

I don't think, given the use of leasing and cross-force procurement, too many conclusions can be drawn from the car's 'port of registry'. Half the Mercs in the UK and a similar proportion of VW/Audi wear the K prefix of northants/bucks/beds. Reason presumably is that both companies are quartered in Milton Keynes area.

Avant - How old would you say MI 65 CUA is?

Doctors are green