It gets to Type rate a few RAF lads before they go civvy. They go onto a widebody in Thompson or Monarch as a DEC.
Well, an A330 type rating would not be much good for
Thomson - none there or ordered, and the A320 fleet is reducing. And, the days of DEC in any airline with a seniority-related command promotion system are long gone, as they all have plenty of well-qualified and experienced FOs ready and waiting for their command courses.