Who is the living king of Britain now?

I hate to break it to you, but there isn't one...... the current Queen is Elizabeth II, her husband is Prince Philip. Since he is her husband by marriage and not a direct descendant to the throne, he can't be 'King'. When they first got married, his title was 'His Royal Highness the Duke of Edinburgh'. In 1957 the Queen granted her husband the title of Prince, his title is now 'His Royal Highness The Prince Philip, Duke of Edinburgh'. Next in line to the throne is the Queen and Prince Philip's oldest son, Prince Charles. When the Queen dies, he will be 'King Charles'.