As I mentioned in
this thread, it's unusual to find HV and LV running on the same poles in the U.K., other than where they meet at a pole-top transformer.
This is certainly odd to us here in the States as almost all poles have combined systems.
A typical pole in my neighborhood will have the following.
13.8KV at the top (one area I know of actually uses 39 KV at the top of the poles)
120/240 or 208Y/120 volt
Phone copper conductors
Phone Fiber conductors
Municipal Fire Alarm system (Essentially a two wire telegraph system)
Cable TV conductors
If it is a 'Local' power company you may also find other town wiring...in my Town the local power company adds PA speakers to the poles surrounding a fair ground.