Screwfix, very cheap. http://www.screwfix.com/p/self-amalgamating-rubber-tape-black-19mm-x-10m/87717
But you are probably better off using one of these.
http://www.screwfix.com/c/electrical-lighting/insulation-tape/cat850122
you are probably better off using one of these.
Nobody is better off using PVC tape for anything, except possibly sticking it to other people's stuff to annoy them.
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Screwfix, very cheap.
http://www.screwfix.com/p/self-amalgamating-rubber-tape-black-19mm-x-10m/87717
But you are probably better off using one of these.
http://www.screwfix.com/c/electrical-lighting/insulation-tape/cat850122