(Another 2-part post):
Hi Andrea
Thanks for your reply (and for the compliments!).
I can't answer all of your questions (because I don't have Sky) but I can deal with most of them.
I'll start with a bit of clarification:
'Freeview' is solely a terrestrial service, received through a conventional TV aerial, with either a set-top box or a TV set with a built-in digital tuner. It's completely separate to the various satellite services (detailed below) and carries a different selection of channels (although there's quite a bit of overlap with the satellite services). To see what's available on Freeview, see here:
http://www.freeview.co.uk/freeview/Channels
As stated in my original post, there are lots of 'FTA' channels which you can receive using your Sky box (without a valid viewing card). To the best of my knowledge, it doesn't matter whether you leave your old Sky card in the box or not (but you might as well leave it in place). You can also get the extra FTV channels by purchasing a 'Freesat from Sky' card for �20. The FTA channels are listed in black here:
http://www.vowles-home.demon.co.uk/Sat/SkyFTA. htm
The additional channels you can get by purchasing a 'Freesat from Sky' card are shown in mauve on that list.