Please answer the following question: Information:  - Anthony Charles Lynton Blair, (born 6 May 1953), commonly called Tony Blair, is a British politician who served as the Prime Minister of the United Kingdom from 1997 to 2007 and the Leader of the Labour Party from 1994 to 2007. Together with President George W. Bush in 2003, he initiated the Iraq War with the invasion of Iraq, an act which remains highly controversial.  - The Winter of Discontent refers to the winter of 197879 in the United Kingdom, during which there were widespread strikes by public sector trade unions demanding larger pay rises, following the ongoing pay caps of the Labour Party government led by James Callaghan against Trades Union Congress opposition to control inflation, during the coldest winter for 16 years.  - Gavin Steel Strang ( born 10 July 1943 ) is a British politician who served in the House of Commons for forty years ( 1970 -- 2010 ) , representing Edinburgh East in the Labour interest . He served as a minister in the 1974 - 1979 government under Prime Ministers Harold Wilson and James Callaghan as well as in the Cabinet under Tony Blair . By the time of his retirement he was the longest - serving incumbent Scottish MP .  - James Harold Wilson, Baron Wilson of Rievaulx, (11 March 191624 May 1995) was a British Labour Party politician who served as the Prime Minister of the United Kingdom from 1964 to 1970 and 1974 to 1976.  - Margaret Hilda Thatcher, Baroness Thatcher, (13 October 1925  8 April 2013) was a British stateswoman who was the Prime Minister of the United Kingdom from 1979 to 1990 and the Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British prime minister of the 20th century, and the first woman to have held the office. A Soviet journalist dubbed her The Iron Lady, a nickname that became associated with her uncompromising politics and leadership style. As Prime Minister, she implemented policies that have come to be known as Thatcherism.  - The Prime Minister of the United Kingdom is the head of Her Majesty's Government in the United Kingdom. The prime minister (informal abbreviation: PM) and Cabinet (consisting of all the most senior ministers, most of whom are government department heads) are collectively accountable for their policies and actions to the Monarch, to Parliament, to their political party and ultimately to the electorate. The office is one of the Great Offices of State. The , Theresa May, leader of the Conservative Party, was appointed by the Queen on 13 July 2016.  - The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign country in western Europe. Lying off the north-western coast of the European mainland, it includes the island of Great Britain (the name of which is also loosely applied to the whole country), the north-eastern part of the island of Ireland, and many smaller islands. Northern Ireland is the only part of the UK that shares a land border with another sovereign statethe Republic of Ireland. Apart from this land border, the UK is surrounded by the Atlantic Ocean, with the North Sea to its east, the English Channel to its south and the Celtic Sea to its south-south-west, giving it the 12th-longest coastline in the world. The Irish Sea lies between Great Britain and Ireland. With an area of , the UK is the 78th-largest sovereign state in the world and the 11th-largest in Europe. It is also the 21st-most populous country, with an estimated 65.1 million inhabitants. Together, this makes it the fourth most densely populated country in the European Union.  - Leonard James "Jim" Callaghan, Baron Callaghan of Cardiff, (27 March 1912  26 March 2005) was a British politician who served as the Prime Minister of the United Kingdom from 1976 to 1979 and the Leader of the Labour Party from 1976 to 1980. Callaghan is to date the only politician in history to have served in all four of the "Great Offices of State", having been Chancellor of the Exchequer from 1964 to 1967, Home Secretary from 1967 to 1970, and Foreign Secretary from 1974, until his appointment as Prime Minister in 1976. As Prime Minister, he had some successes, but was chiefly remembered for the "Winter of Discontent" in 197879. During a very cold winter, his battle with trade unions led to massive strikes that seriously inconvenienced the public, leading to his defeat in the polls by Margaret Thatcher.    After reading the paragraphs above, choose the best answer for the entity that related to 'gavin strang' with the relationship of 'member of political party'.  Choices: - caps  - conservative party  - labour party  - republic  - union
A:
labour party