Although there is as yet no official confirmation from the BBFC, Odeon cinemas are listing The Golden Compass as 12A on their website. This seems to be the most likely rating considering the film’s PG-13 certificate in the US.
Some more good news for UK residents is that there will be advance screenings of The Golden Compass on the 5th and 6th of December. However it is not clear whether all cinemas will be participating in this, so please check with your local cinema to avoid disappointment.