Post Office & Ors v British World Airlines Ltd.  The Post Office chartered two aircraft from BWA to carry the mail of certain Post Office customers. The contract with BWA provided by cl. 4 that BWA was responsible for the loss or damage of any mail and would be liable to pay to the Post Office an amount equal to the amount which the Post Office paid to the owners of such lost mail as compensation, not exceeding the maximum amounts payable under the Post Office Act 1969.