I have a url
and two proxy servers. Both servers are BM3.8 SP3 with the latest patches.
The only difference is proxy1 is on old hardware and is due to be replaced
by proxy2, which has newer hw

When I point proxy1 at the above URL I get the required page(an
address/regional program checker), but when I point proxy2 at this website,
it redirects back to the main www.sky.com website

I have looked for ages and can't see why it would do this

Any ideas?