How big a majority did thatcher win by in 1979?

In the 1979 general election, Margaret Thatcher's Conservative Party won a significant majority, securing 339 seats out of 635 in the House of Commons. This resulted in a majority of 43 seats over the Labour Party, which had 269 seats. Thatcher's victory marked the beginning of her first term as Prime Minister, ending 13 years of Labour government.