Boots is a British chemist and their slide film is okay, it seems. You can judge the film by this shot, although it was expired film, so brand new film from Boots might be different now. A lot of the colour is from the Lomo lens, of course.
Not really, check ebay. That's where I got mine, unless there are Boots shops where you are, but I don't think there are in China. It's not exciting film though, so I wouldn't go out of my way to get it. I'd reccomend Agfa RSX or Fuji Velvia or Fuji Sensia. Much better than Boots.
Also, the green and orange on this shot is from using coloured filters, rather than the film expiring.
hahah yeah, I've never seen any boots film here in China. I really like Kodak Ektachrome, its great for x-pro. Don't Fujifilms come out really crazy when you x-pro them, I remember getting a roll of fujifilm back and it was all really red! Have you ever heard of Konica Infrared film? I picked up a roll of it today, heard from people on the internet that it got discontinued something like 10 years ago!