WARSAW—Poland will summon the British ambassador to explain why a journalist accused of anti-Semitism, Islamophobia, homophobia, and the justification of rape was refused entry to Britain, a deputy foreign minister said on Monday. Rafal Ziemkiewicz was detained at London’s Heathrow airport on Saturday after travelling to Britain with his wife and daughter, who is starting a course at Oxford University. He was subsequently denied entry and flew back to Warsaw. In a letter posted on social media by a British lawmaker, the UK border force attributed the decision to “conduct and views which are at odds with British values and likely to cause offence.” “This week I will invite British Ambassador Anna Clunes to the Foreign Ministry to make sure that freedom of speech is included in the catalogue of British values and to ask how this corresponds to the attitude of British services to Rafal Ziemkiewicz,” Deputy Foreign Minister …