Have you got any pictures or have I just gone blind?
Roadsters generally came in two flavours at that time. There is the traditional roadster with rod brakes, usually, but not always with fully enclosed chain (a mixed blessing). Single, 3 and 4 speed versions were available, occasionally you may come across coaster or drum brakes on them. Dynohubs are also common. The fact yours has a DBU would suggest the upmarket Superb model, probably with one of the fancier Brooks triple sprung saddles. The correct model name for one of these is the DL-1 for the single speed and DL-1 Tourist for the geared one and they were in producution in Nottingham from about 1913 to 1985. They were also badged as other members of the Raleigh family.
Here is my Rudge, which is basically the same thing with a different fork crown.
There is also the "light" Roadster or Sports bike. Similar in many ways but much lighter, cable caliper brakes, more sporting frame geometry, 26" wheels (stainless steel rims if you're lucky) and probably a more basic Brooks B66 saddle or maybe a vinyl mattress saddle.
Both are fine machines, you won't win the TdF but fast enough for normal cycling, and supremely comfortable and practical. Be wary of rod operated brakes, they are adequate in dry but absolute shoot in the wet. You get used to it. Raleigh specific parts like headsets and BB cups can be difficult to find as the threading was different to the norm but in reality, these parts were of such high quality that nearly everything can be re-used.
You will find information
here.