It seems I'm the only one who didn't know.

[martc]

Every ice cream van and kit car made in the early 1970's used Cortina Mk1 "CND" rear lights.

[quicksilver]

The Optare StarRider minibus used Mk3 Granada headlights and the coach versions also had upsidedown Granada hatch rearlights. Other car parts bin raiding by minicoach builders includes the Merc M-class headlights on the original Sitcar Beluga and Fiat lights on the Indcar Maxim (Mk2 Punto front, Brava rear). Mk2 Punto headlights were also used on the MG SV but you probably all knew that already - there's an urban myth that Longbridge used to buy them over the counter from the local Fiat dealer.

 

Oh and the Leyland Roadrunner shares its headlights with the Maestro.