Sky.com

[scarlets fan]

Why has this /# begun appearing after my sky.com address

[Buenchico]

It's a redundant 'fragment identifier'. Adding a # onto a URL, and then following it with further information, allows a link to go to a particular part of a page instead of to the top.

e.g. this link goes to the top of a page:
http://en.wikipedia.org/wiki/Stephen_Fry
but this one skips to the top of a particular section:
http://en.wikipedia.org/wiki/Stephen_Fry#Personal_life

But some websites use coding that places a #, with nothing following it, onto the end of a URL that's intended to go to the top of the page (and then add further data if links are required for further down). That appears to be the type of coding that's being used on the page you refer to.