The 45-year-old drama teacher made £150,000 when she sold her Islington flat four years after buying it from the council. Lady Thatcher created the right-to-buy scheme when she came to power in the early 1980s in a bid to increase home ownership. Council house residents were offered the chance to purchase their properties at low prices from local authorities. Miss Blythe, from Worthing, West Sussex, purchased the leasehold of a flat in a pleasant Victorian town house for £141,000 from Islington Council in June 2006. Four years later, she sold the North London property for £298,000. If she had sold it within three years, she would have had to repay some of the proceeds to the council.