Casper87, it was one frequency and I'm not sure what that was but it seemed to cover (according to matching callsigns to radar virtuel) the Midlands, around the Manchester area - specifically high level stuff from about FL200 to FL410.
Unfortunately it has now gone down - yet another victim of our stupid archaic laws.
Please visit http://yourfreedom.hmg.gov.uk/repealing-unnecessary-laws/air-traffic-radio-listening-rebroadcast
and comment/signup. Together perhaps we can make a difference.
To Yachydda (who posted on the want to hear UK atc thread), it was his stream I had been avidly listening to for the last week or so and encouraging others to listen to. Many thanks.
Edit - Sound quality was better than ANY feed I'd ever heard before. No interference, no readability issues -Crystal clear all the way.