[Alex van de Wetering]

Ian,

I never noticed the "K", but on closer inspection I have now seen the same "K" appear on several vehicles....not only staff cars, but also an F8, HUP, C15A, Diamond T969, Mack LMSW etc. The "K" always shows up on the right hand side of the vehicles, usually on the right rear, but in case of the Diamond and Mack it shows up on the support legs of the wrecking gear.
I have no idea what it means, although I think it could have something to do with inspection of the vehicles(?). What all vehicles seem to have in common, is that they were all pictured in the same location, the depot in the UK.

Alex