hong kong important areas hong kong one country two systems framework come grow pressure illustrate developments report mainland security officials operate autonomous city british government report say thursday one country two systems principle implement former british colony return chinese rule 1997 promise city high degree autonomy independent judiciary range freedoms enjoy mainland china former colonial power issue report hong kong every half year since late cover developments first six months year british foreign secretary boris johnson say guide principle generally function well however time ignore important areas one country two systems framework come increase pressure johnson write examples include report mainland security officials operate within hong kong say without elaborate well report local beijing representative office heighten influence city first time half-yearly report stop short raise concern five hong kong booksellers disappear late 2015 late mysteriously re-emerge mainland chinese custody one five men swedish citizen gui minhai still chinese detention report also touch upon apparent abduction chinese billionaire xiao jianhua january disappear downtown hong kong apartment wheelchair head cover although hong kong authorities say evidence suggest mainland law enforcement agents act hong kong soil johnson note many hong kong internationally highlight numerous similarities xiao jianhua apparent abduction case hong kong booksellers also say look forward welcome city newly sworn-in leader carrie lam visit london discuss close co-operation uk hong kong uk prepare leave eu response report hong kong government say foreign governments interfere internal affairs city since return motherland hksar special administrative region exercise high degree autonomy ... demonstrate full successful implementation one country two systems principle widely recognize international community hong kong 's 'one country two systems framework pressure britain