err
Play around with it untill you find something that works
thats what i did!
maybe connect the 2 swtich boxes together?
do they have a button to swtich connections to more than one output
e.g i have one that has connectors for
A B C TV
And i can do
a > tv, b > tv, c> tv like normall
but then i have a button for
C > A and B > A so i would plug the VCR in A
I also had a lead which had a scart plug on one end and 6 phono connections on the other its really usefull
as i put the scart connector in the vcr then put the 3 photos for input into the dvd players output and the the 3 photos output into the scart switchbox now as long as my vcr is on i can watch dvds without fiddleing with wires.
as the signal goes dvd > vcr av1 > tv though the same scartplug
(cus scart has both in/out pins and this cable uses them all)
Hope i made some sence there and if it helped at all.
EDIT
if they cant do this 'resend' funcution id prob plug one into the vcr and connect the dvds output and the stb output (allowing u to watch them though rf)
id then probbaly use the other scart on the ntl stb for the dvd recorders input that would allow u to record digi tv.
problem there is no connection to tv so youd have to use vcr for RF to watch tv so not ideal