RAF Upavon trialling various vehicles for service use, one of the vehicles that they trialled was a London Taxi. Which to be honest would have been a good acquisition.
Trouble was even though painted RAF grey with a yellow cheat line down the side and Royal Airforce emblazoned along the yellow band, every time it went down the local Railway Station to pick up XYZ it was filled with half of the local population telling the SAC driving take me to..... And they used to refuse to get out even when told it was one of her Majesties finest.