Hendersons, But Not Relish.

[boginspro]

QUOTE FROM FIRST LINK :-

Henderson sidecars were made by the Aero works of Fitzwilliam Street, Sheffield.

In November 1919 the company announced the Sheffield Henderson Motorcycle, designed by Leonard B. Henderson, who was an aeronautical engineer. In a relatively short time the make gained a fantastic reputation in speed events; in June 1922 the factory even claimed several world records in the 250 cc class.

Sheffield Hendersons could be had with a side valve or overhead valve Blackburne engine or a Bradshaw engine. The machine had a three speed Burman gearbox.

The Motor cycle wrote in 1922: Their curious but not unattractive-looking frame construction is now familiar to most people. Indeed, Sheffied Henderson must have been one of the very few makes that placed the toolbox under the top tube behind the steering head, a position that obviated a rather unusual tank shape, an early form of saddle tank.

However, fame was short-lived: Sheffield Henderson motorcycle production ended in 1923.

UNQUOTE

The one with Blackburne engine and Burman box sounds good, I had an OEC with that configuration.

http://motorbike-search-engine.co.uk/classic_bikes/misc-classics-p-s.php?zanpid=10191_1510860381_c23627925eac82464021164ff1ae25bd

One for sale on Bonhams in 2014 for £8.000 to £10.000.

https://www.bonhams.com/auctions/21898/lot/289/