By James Pomfret, Martin Quin Pollard and William James HONG KONG/BEIJING/LONDON (Reuters) -Britain told China’s Charge d’Affaires in London that the right to peaceful protest must be respected, after he was summoned to explain an incident in which a protester was seen being pulled into the grounds of a Chinese consulate and beaten. British police are investigating the incident, which occurred in Manchester, England during a demonstration against Chinese President Xi Jinping. Officers entered the consulate grounds to rescue a man who they said “was dragged” inside and assaulted by several men….