[jpluscplusm]

It's not the "British Facebook", it's someone who bought the domain and pointed it towards Google Sites. See http://www.facebook.co.uk/ .

[valgaze]

Of course, I was not able to see the Google sites connection, but it makes sense a squatter would snatch the url and direct it to their own site for affiliate monies or something along those lines

[jpluscplusm]

Open the www. URL and open the "sign in" link in the site footer.