Leyland site office lorry
Model appeared in 1966 according to the Moko Lesney Matchbox Toy Collecting website.
Transport of a site office
Scale given in the catalogue: 1/92.
It is a fourth-generation Comet model, manufactured from 1964 to 1975. The cab, named Ergomatic, has been used on many types of Leyland and even on other English lorry brands (according to Wikipedia).