Prostitution is entirely legal in the UK.
It is however illegal to solicit your self on the street or in windows.
It is also illegal to prostitute someone else, or take profit for someone else's prostitution.
Hence entrepreneur s AND brothels are illegal.
And just because prostitution is legal here it doesn't mean it is regulated. Most prostitutes still do it out of need of money for drug use, and STDs are still common among prostitutes.