It may well be that rusty old "bog standard" Ford Escorts enter the depot, only to be released back onto the streets a few days later having engines modified in order to reach 150 mph and their brakes and suspensions up-rated to cope with that "little extra" under the bonnet!
I thought everyone knew where the cars were serviced? Every part of HMG used to get their cars done there
I see no-one mentioned the temp working for the CPS who was allowed to use an Astra estate, took it home one night and crashed head on into a police car in Camden whilst drunk. Arrested and then found to be a member of a well known republican organisation Turns out we were lucky he hadnt realised how close he had been to Thatcher's car whilst in the workshops and had just been trying to earn some spare cash.