The house flag of the Strick Line Ltd, London. A white, swallow-tailed burgee with a blue border at the top and bottom edge. Four chevron stripes, alternatively red and blue are placed across the centre. The flag is made of a wool and synthetic fibre bunting. It has a cotton hoist and is machine sewn. A rope and two Inglefield clips is attached.

The line was founded by Frank Clarke Strick (1849-1943), a Swansea businessman with a background in coal exporting and shipbroking. He began his career as a shipowner in 1887, his vessels carrying coal to the Mediterranean ports and the Gulf and importing iron ore. By 1913, Strick's companies, La Commerciale Steam Navigation Co. Ltd, The Anglo-Arabian and Persian Steamship Co. Ltd and Anglo-Algerian Steam Ship Co. (1896) Ltd had all merged to form Strick Line Ltd.

The company was sold in 1919 and shortly afterwards became Strick Line (1923) Ltd, a part of the P&O group. In 1946 the company name reverted to Strick Line Ltd. In the post-war period the company traded worldwide, and in particular with the Gulf States. It was taken over by P&O in 1972 and went out of existence in 1974.