I don't know about the the UK, but the US Platinum Collection DVD box set goes for 49.99USD on Amazon.com, which isn't a bad price. I don't think their international shipping charges are too bad, so it may be worth checking out. I wouldn't be surprised if Blu-ray releases are on the horizon though. But then again, maybe that won't come until after all of the new films have been released.
Also, in regards to the TV airing of Ha, it seems they will be having a special engagement at some movie theaters where they will be playing the TV version in theaters at the same time as the TV airings. The fact that they are making this such an event makes me even more inclined to believe that we will be getting some pretty good info about Q come August 26.