I am looking for a Freeview Set Top Box. Could someone tell me what
specifications do I need to enable me to
1) Watch TV on one channel and record on another (assuming it's not 2
different digital channels, I guess)
2) Enable me to keep on using TV remote control to view BBC1, BBC2, ITV,
Channel4, Channel5 and switch to the "AV" channel on TV to view the digital
channels (including the digital versions of BBC1, BBC2, ITV, Channel4,
Channel5), as I believe the analog and ditigal teletext are slightly
different?
3) VCR to have an analog feed as well (so the tuned channels could stayed as
is, an an additional feed for channels selected from the set top box)

In particular, it looks like most Set top boxes have RF loopback, but would
I need 1 or 2 SCART sockets? How could I wire the TV, VCR and the Freeview
set top box together to achieve the above?

Note that both my TV and VCR has
1) 2 SCART sockets
1) 1 aerial socket