The collection was donated to the Luton Museum Service in 1991 (now Stockwood Discovery Centre part of Luton Culture) and has examples of horse-drawn road vehicles and carriages used in Britain dating from Roman times up until the 1930s.

The collection is significant to the people of Luton, Bedfordshire as it documents the life's work and passions of a local man.

It is also of national significance as the largest private collection of horse-drawn vehicles.

Shortly after the First World War, Mossman left school and started work for a local butcher, Panters, in Park Street, as a delivery driver.

He acquired a leasing company providing horse-drawn carriages for films.