The Indian parliamentary system differs from the British system because of option 4, the system of judicial review.

Option 1, `both a real and a nominal executive` does not distinguish the Indian system from the british one as both countries also operate using a real and a nominal executive - the Prime Minister being the real executive and the President or Monarch being the nominal one.

Option 2, `a system of collective responsibility` refers to the idea that ministers and government members are collectively accountable for their actions to the parliament. This is not unique to India and it`s also an aspect of the British parliamentary system.

Option 3, `bicameral legislature`, which means a legislature that has two houses or chambers like the Rajya Sabha and Lok Sabha in India or the House of Lords and House of Commons in UK, is also common in both countries.

Option 4, the correct answer, refers to `the system of judicial review`. In Indian system, the judiciary has the power to interpret the Constitution and annul laws and directives if it finds them to be unconstitutional, whereas in the British parliamentary system there is no judicial review as such due to the principle of parliamentary sovereignty.