I've tried the flow control -> connections setting it to 4 but that didn't seem
to change what appears to be the limit of 2.

Nevertheless, amidst all these, it's managed to trawl through to 68% of the
site. So hopefully we'll get a full copy before the host pull the plug or
something.

I'll see if I can find a smaller site to test on after this to determine if
it's just this site that's refusing to accept more than 2 connections at a
time or something.

Thanks for your patient help!