Reg Nos and rebuild plates

[Nick Bullock]

Hi All
I have been trying to decode the serials on a postwar rebuild plate and wondered if any reader could add a little more maybe?

The plate claims an 'S' Repair was carried out on 4/55 at B269, Which i understand to be a commercial garage.

What would an 'S' repair denote, is it a grade of rebuild?

additionally the vehicle reg is 79ZB85, I haven't previously noted any ZB registrations, maybe just not looking closely enough. Does ZB mean it is likely to be ex RAF?

Interestingly this vehicle was in private ownership in Manchester by Sept 1958, so was presumably disposed of earlier in the year, Are there any disposal catalogues out there that may list it for sale

the vehicle is a Humber Box

regards

nick