Re: Sites?
BAN CHEMISTRY! THINK OF THE CHILDREN!
Labour government tried. And succeeded - it was discussed in the House of Commons at the time.
I remember writing to my MP regarding Labour using court orders to prohibit potential subversives attending an adult education high-school level Chemistry course a few years back.
So UK government has indeed tried and has successfully applied a CHEMISTRY BAN to suspect on the basis of the mere suspicion that said suspect may be dangerous.