Item title reads - Chelsea.
New type picket boat with speed of over 20 knots is tested for Royal Navy on the river Thames. London.
L/S as the new diesel powered boat speeds over the water. C/U of water, C/U of man turning the wheel. M/S as the boat turns quickly. C/U as water rushes by. C/U as it sails close to the camera.
Cataloguer's note: the soundtrack to this item is missing.