Hi there. I live a few minutes from the Bahia, so thought I'd go and ask them. Afraid there are no British tour operators using the Bahia, only German and Scandinavian, but there are British guests who book direct -
http://www.hotelsviva.com - or through agents, one of which is
http://www.holidaynights.co.uk. That's the info from the guy on reception. Hope it helps!