1. We have Sky+ on an ntl line. Works OK but the thing is just connected to the phone for the PPV services if you wanna subscribe via phone, usage stats
etc.
2. They'll install a phone splitter or something, to get the cable to the sky box.
3. dunno
4. ring sky, high street and other stores also sell Sky.
5. you could try digital spy but the least said about there the better, least said soonest mended and all that.
Don't get an Amstrad box though, they really are the pits.