In 1961, 1964, and 1966, the pound came under renewed pressure, as speculators were selling pounds for dollars. In summer 1966, with the value of the pound falling in the currency markets, exchange controls were tightened by the Wilson government. Among the measures, tourists were banned from taking more than £50 out of the country in travellers' cheques and remittances, plus £15 in cash; this restriction was not lifted until 1979. The pound was devalued by 14.3% to $2.40 on 18 November 1967.