If the forward margin is negative, the foreign currency is at a forward premium to sterling (i.e. it is more expensive) and sterling is at a forward discount to the particular foreign currency (i.e. it is cheaper).
Conversely, if the forward margin is positive, the foreign currency is at a discount to sterling and sterling is at a premium to the currency.
These are middle market rates (mean of the spot buying and selling rates) as observed by the Bank's Foreign Exchange Desk in the London interbank market during the late afternoon. They are not official rates and are no more authoritative than rates provided by any commercial bank operating in the London market. The outright three-month forward mid-rate is calculated by adding sterling's forward premium or subtracting its forward discount from the spot rate.
Figures shown here up to and including 1983 3rd quarter are averages of Friday observations. Thereafter, they are based on daily observations.