No programs for the UK unless you pay CAA ATC fees (i.e. you are an airline or aircraft operator).
The CAA decided to remove the data from the FAA flight tracking feeds a few years back, and require that individual companies 'prove' their credentials before seeing the data...
...so the answer is not for the average enthusiast.
The CAA was working on a public system a while back, but I believe it got put on hold after 9/11.
[Edited 2005-04-14 20:30:37]
I'd rather be on the ground wishing I was in the air, than in the air wishing I was on the ground!