Hi
Steve and welcome to
Kitz' forum,
As you realise, there are numerous amateurs here, myself included. Now I have just (as in the last 24 hours) received a PM from a new forum member, "
Black Sheep", introducing himself to me. Reading between the lines of
BS' message, I understand that he is a serving
Openreach engineer who would like to share his knowledge and experience with us all. (Obviously certain things will not be discussable, for the well-being of his employment.)
As for
DP, that is a simple one. It is nothing more that a Distribution Point from where individual service cables "fan out" to the respective properties. A DP may be underground or may be at a pole top, from which the individual service cables are known as "Drop Cables" (or wires).
The abbreviation
UR is something I do not recognise. (I could attempt to inject some humour by suggesting "Underground, Rusted" . . .
)
Hopefully
BS will be along later to either confirm or correct my caterwauling.