The term 'OLD BLOC IN PARLIAMENT' refers to the Whigs, a British political party that existed from the 17th to 19th centuries. The Whigs were a powerful force in British politics during this period, and were known for their support of constitutional monarchy and opposition to absolute rule. They were also known for their support of civil liberties and religious toleration. The Whigs were eventually replaced by the Liberal Party in the mid-19th century.