There are two types of this launch, a standard version and a lighter version. The information sheet for the drawings below state:

“This design was developed in 1935 to replace the existing 45ft Motor Launch,; the new design to be a lighter craft to be carried in reconstructed capital ships and to be within the lifting capacity of the aircraft cranes.”

Drawings of the standard type have no yet been located.

WITH THE ROYAL MARINES ASHORE AND AFLOAT. 1940, ON BOARD HMS RODNEY AND ASHORE. THE VARIOUS TASKS PERFORMED BY THE ROYAL MARINES.
WITH THE ROYAL MARINES ASHORE AND AFLOAT. 1940, ON BOARD HMS RODNEY AND ASHORE. THE VARIOUS TASKS PERFORMED BY THE ROYAL MARINES. © IWM (A 129)

This barge is the standard type.