For over 30 years Margaret Thatcher was the Member of Parliament for which London constituency?

Finchley was a constituency represented in the House of Commons of the Parliament of the United Kingdom. It elected one Member of Parliament (MP) by the first-past-the-post system of election; its best-known MP was Margaret Thatcher, Prime Minister from 1979 to 1990. Although boundary changes meant that she never again attained her large majority of 1959, she was nonetheless returned by comfortable (9,000) majorities at General Elections throughout her premiership.

Thatcher first won her seat with Finchley in 1959. She went on to hold the seat for a further eight more elections before stepping down for election in 1992. Thatcher had held the seat for over 32 years.

The seat was abolished in 1997 and split between the Finchley and Golders Green and Chipping Barnet constituencies.