Britain has summoned the Chinese ambassador to express concern over the decision not to allow a UK rights activist's visit to Hong Kong.
"We are very concerned that Ben Rogers, a UK national, was denied entry into Hong Kong on 11 October in absolute disregard of the 'one country, two systems' principle," Foreign Office minister Mark Field said in parliament.
He added: "Foreign Office director-general for economic and global issues summoned the Chinese ambassador on this issue over the past few days."
Rogers, is a co-founder of the ruling Conservative Party's Human Rights Commission. He has been a loud critic of Chinese-ruled Hong Kong's treatment of human rights activists, including that of jailed student protest leader Joshua Wong.
Last week, Foreign Secretary Boris Johnson said London needed an explanation from Hong Kong and Beijing regarding this situation.