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Motor vehicle distributors, of Henly House, London
1923 London agents for Alvis (see advert)
1933 Concessonaires for Avro Avian and Spartan Aircraft for the United Kingdom. Aviation Manager: B. S. Allen. Branch: Heston Air Port, Hounslow, Middlesex. Head Office: Henly House, Euston Road, London, N.W.1. Branches: Bournemouth, Bristol and Manchester.
WWII Work included making 250,000 tank and aircraft assemblies, repairing 1000 aircraft, handling 80,000 tanks as well as assembling 25,000 army vehicles of all types, as well as repairing and maintaining many service vehicles. Acquired Arthur Mulliner Ltd, coachbuilders, of Northampton. Also owned Cater Motor Co in Bristol, David Rosenfield in Manchester, and Pass and Joyce in London, and J. H. Plater and Co in Streatham 
1946 Acquired Sandhurst Motors in Camberley, as part of the strategy to enhance the company's position as "England's leading motor agents".
1968 Acquired Stewart and Ardern
1984 Canadian group Midepsa, controlled by Michael Ashcroft and David Wickins, owned almost 30 percent of the company and bid for the rest
1986 Midepsa assumed the Henlys Group name
1989 Acquired by Plaxton's, builders of buses and coaches
1992 Plaxton's was renamed Henlys Group PLC.
1997 Sold the motor dealerships to a new company HMG to concentrate on bus building; HMG could use the Henlys name for the dealerships but not in the company name
1999 Acquired Blue Bird, the US school bus maker
TransBus International inherited a number of factories around the United Kingdom from all three merged companies: the former Alexander factories in Falkirk and Belfast, the former Plaxton's factories in Anston and Scarborough, the former Northern Counties factory in Wigan, and the Dennis factory in Guildford.
2004 Mayflower collapsed due to heavy debts; TransBus International was put into administration. A consortium of Scottish investors rescued the Guildford, Falkirk and Larbert operations under the new combined name Alexander Dennis. In place of the Plaxton factory in Wigan, a new aftermarket headquarter and parts warehouse was established in neighbouring Skelmersdale. The Plaxton activities at Scarborough and Anston were the subject of a management buy-out.
2004 Creditors assumed control of the company
2004 The former Plaxton activities at Scarborough and Anston were subject to a management buy-out.
2007 Alexander Dennis acquired the Scarborough and Anston operations that had been sold to their management.