Avoid beginning words with capitals as much as possible; but use them in the following and similar cases:
Act, when referring to Act of Parliament or Acts of a play; also in Baptist, Christian, Nonconformist, Presbyterian, Puritan, Liberal, Conservative, and all denominational terms and names of parties.
His Majesty, Her Royal Highness, &c.
The King of England, the Prince of Wales.
The Duke of Wellington, Bishop of Oxford, Sir Roger Tichborne, &c.
British Army, German Navy.
Christmas Day, Lady Day, &c.
Dark Ages, Middle Ages.
House of Commons, Parliament, &c.
Government, Cabinet, Speaker.