LOL.. I can actually proclaim to be an authority on RM delivery bikes as my job for many years was over seeing mechanic's training to repair these bikes and general H&S policy on them.
The later bikes are made by Pashley and referred to as 'RM92' delivery bikes with are. To cut a long story short, avoid at all costs. There is a fault with them where many of them were not built with enough care and attention and too much heat was applied to the lug that holds the down tube to the head tube during manufacture which changes the structure of the tube making it hard and brittle. Combine this with a 15kg post bag on the front and a Postie half awake at 6am bouncing up and down kerbs you have a bike that catastrophically fails when the head tube parts company with down tube.
If the front end does not fall off then your lucky but and most that have finished their service got sent to Africa so they could fall apart over there. So if you are seen on a original Red postie bike and cannot show paperwork to say you work for Royal Mail or brought it though legitimate channels your likely to get questioned to why your riding around on one of the many thousand nicked posite bikes.
If you want a retro town cruiser buy a dutch postie bike, EBEL Swiss army bike, French MBK delivery bike but at all costs avoid the bull**ite middle england Pashley logo at all costs. They are like the British Leyland of the cycle world. Expensive, not very efficient or good at building bikes and tent to rot away.... Bee has escaped from my bonnet now !! LOL.