At the Bovington Tank Museum you can get close up and personal with the first tanks that were built and used in combat, such as the Mark IV Tank.
First World War tanks, namely the British Mark IV, started the practice of carrying fascines on the roof, to be deployed to fill trenches that would otherwise be an obstacle to the tank.
The Mark IV was a British tank of the First World War. Introduced in 1917, it benefited from significant developments of the Mark I tank (the intervening designs being small batches used for training). The main improvements were in armour, the re-siting of the fuel tank and ease of transport. A total of 1,220 Mk IV were built: 420 “Males”, 595 “Females” and 205 Tank Tenders (unarmed vehicles used to carry supplies), which made it the most numerous British tank of the war.
The “Male” tanks were armed with three machine guns and two 6-pdrs. Whilst the “Female” tanks had Five .303 Lewis machine guns.
The Mark IV was first used in mid 1917 at the Battle of Messines Ridge. It remained in British service until the end of the war, and a small number served briefly with other combatants afterwards.
I have been working on a metal 15mm Mark IV Tank for use with the Home Guard.
Though I do really like the Flames of War Great War models, which have a lot more detail.
I also have a gallery of Mark IV tanks from a wonderful 28mm demonstration game at GamesDay 2007.