Insulation Tape,: decent stuff not crap, and is suitable for, well, just about anything. It`s nice and sticky and stretchy, so it`s perfect for taping the cable to the side of the pole, amongst 1001 other things. One thing it is not for is sealing outside joints. Not unless you`re name is Bertie (as in Bodger).
The insulation tape is 0.12mm thick, 19mm wide, and flame retardant. BS60454.
P&P is cheaper for this item if you phone the order through !
Also see self amalgamating tape.