The numbers of recruits to the department varies, according to the standard of recruit. It is reassuring to know that the standards are maintained (to a greater or lesser degree) and, in general, the department takes those that make the grade, rather than a set number. In general, posts are advertised annually.
As you may realise, movement from the department is minimal. Some take promotion, some go to other specialist posts. Seldom do people go from CO19 back to borough at the same level they came in. Those that do have probably realised that the job is beyond them, which in itself is laudable. Better to do that than hang on in a job you can't do, where the lives of your colleagues and the public are at risk.
As you may realise, movement from the department is minimal. Some take promotion, some go to other specialist posts. Seldom do people go from CO19 back to borough at the same level they came in. Those that do have probably realised that the job is beyond them, which in itself is laudable. Better to do that than hang on in a job you can't do, where the lives of your colleagues and the public are at risk.