Geo TV, a free to view Pakistani channel on Sky, Channel 815, is showing all the Twenty20 World Cup matches live. You don't need a subscription. The only downside is that their commentary is in Urdu. But the feed seems to be the same as Sky Sports. You could turn the sound down on your tv and listen to the commentary in English on BBC Radio.
I watched the Scotland v Pakistan game today and the thriller between Zimbabwe and Australia.
England v Australia still to come.
Hope this comes in useful for some people.
Link to their website http://www.geo.tv/twenty20wc/default.asp