One one of the other forums, someone recently wrote in asking about the apparent difference in size between two Police Boxes that they have. This reminded me of several years ago, when I purchased the pre-war Police Patrol Set, and compared the box that came with it, to another 1950's era box that I also had. I noticed that the pre-war version was somewhat longer, and looked around for answers, but found no comment on any changes. So I deduced that it must be due to metal fatigue, even though mine is in very good shape. I does show very tiny cracks or lines running through it, under the paint. These pre-war boxes are also painted a darker color the post war. Below are a couple of photos of mine, and would like some feedback or comment if you have also notice this.
The pre-war version is on the left in both of these photos