When I visited Bovington last year they had a StuG III on display.
It had been on display at The Imperial War Museum Duxford, but was returned to the Tank Museum at Bovington in December 2019.
Here David Willey discusses the Sturmgeschütz III Self-Propelled Assault Gun, better known as the StuG III, Germany’s most numerously produced fully tracked Armoured Fighting Vehicle of the Second World War.
This was a late model StuG III supplied to Finnish forces. Has Saukopf gun mantlet introduced February 1944. It is the only vehicle left carrying original ‘waffle pattern’ zimmerit.
The final and by far the most common of the StuG series. The Ausf. G used the hull of the Pz.Kpfw. III Ausf. M. Upper superstructure was widened: welded boxes on either sides were abandoned. This new superstructure design increased its height to 2160mm. Backside wall of the fighting compartment got straightened, and ventilation fan on top of the superstructure was relocated to the back of fighting compartment. From March 1943, driver’s periscope was abandoned. From May 1943, side hull skirts (schurzen) were fitted to G models for added armor protection particularly against anti-tank rifles. Side skirts were retro-fitted to some Ausf. F/8 models, as they were be fitted to all front line StuGs and other tanks by June 1943 in preparation for the battle of Kursk. Mountings for side skirts proved inadequate, many were lost in the field. From March 1944, improved mounting was introduced, as a result side skirts are seen more often with late model Ausf G.
Here is the link to the StuG III Miniatures Gallery. I also have a workbench feature on the Flames of War StuG III Assault Guns.