I've copied (and removed the links from) the below, from the wikipedia article about the 1976 sterling crisis. The situation now is uncannily similar.
The 1976 sterling crisis was a currency crisis, in the United Kingdom in 1976. Inflation (at close to 25% in 1975, causing high bond yields and borrowing costs), a balance of payments deficit, a public spending deficit, and the 1973 Oil crisis were contributors.
The origins of the crisis are traced to the 1972 Conservative "spend for growth" budget that initiated the inflation cycle.
James Callaghan's Labour government had to borrow $3.9 billion from the International Monetary fund (IMF), with the intention of maintaining the value of sterling. At the time this was the largest loan ever to have been requested from the IMF.