Interesting video of 18 Pounder Field Gun in the Australian War Memorial in Canberra courtesey of a chap called Stuart Curry.

The ammunition limber is shown in some detail. Nice thought to use blankets as a cushion for sitting on. A walk around the gun shows some of the detail. The gun is an example of a recuperator with the box at the end. This was added due to problems with the spring system.

Wikipedia : Ordnance QF 18 pounder

Landships: The British 18 pounder QF gun

Handbook of the 18-PR. Q.F. GUN - Land Service