I recently went to the Musée royal de l’armée et de l’histoire militaire or Royal Museum of the Armed Forces and Military History in Brussels.
The Medium Mark A Whippet was a medium tank employed by the British in World War I. Developed for fast mobile assaults, it was intended to complement the slower British heavy tanks by using its relative mobility and speed in exploiting any break in the enemy lines.
This Medium Mark A Whippet, A347 Firefly, was on display at the museum, and is still in its camouflage paintwork. It still carries battle damage from when it was hit on 17 August 1918.
Though originally envisioned with a rotating turret, the production model had an armoured housing for three to four 303 Hotchkiss machine guns, which could be relocated between four gun ports. Approved in June 1917, roughly 200 vehicles were produced starting in October 1917. Unlike the large crew of the Mark IV, the Whippet managed with a standard crew of three: a commander, driver and gunner. Given the gunner was responsible for manning both machineguns (which could point forward, left, right and rear), sometimes a second gunner was squeezed in.
I do think that this tank would make for a great base for vehicles for an alternative Great War. It could be converted into a turreted tank, or a self propelled gun. One other idea is to use the models for A Very British Civil War background. There are quite a few Great War tanks that could be used for a 1920s or 1930s civil war within the United Kingdom.