It would be interesting if see them bar the whole google site, google will base servers outside the UK, so the other option would to get ISPs to filter it, which they do not want to pay for. Which to be frank the problem, the government wants ISPs to be their unpaid police, and ISPs do not wish to do it. In china the government provides the filtering so its quite affective particularly as bypassing it, has some pretty tuff penalises.