So I have progressed a little and added the Login Trial module to this page (at the bottom left - visible now).
When I click on Connect it opens the FB dialog and all looks good; the page refreshes but the user is not logged in.
It gets the following JScript error:
Line: 22
Error: Permission denied
Which is this bit of script:
arams)b.fbCallID=a.id;}
It seems to work though and log me in, but on IE it looks bad.