A Special Drawing Right (SDR) is an international unit of account defined by the International Monetary Fund (IMF).  It is commonly used in international legislation and can be converted into national currency in the same way as other foreign currency conversion.  SDR exchange rates are published daily in many UK national newspapers and on the IMF website.

On 12 January 2010, one pound sterling was equivalent to 1.03 SDRs.  The Montreal Convention limits for baggage and delays were thus £1098 (1,131 SDRs) and £4,029 (4,694 SDRs) respectively.