Bacic 1:300 arrangement of an HDML, mounting twin 0.303" MG and a single manual 2 pounder. A 3 pounder could be shipped in lieu.

The ML "1000" type HDML was a standard design produced in large numbers for every possible job conceivable;

• Local Defence
• Training
• Patrol
• Escort
• Tendering
• Search and Rescue
• Local Transport

Being just a few of the roles envisaged. It's basic wooden Admirality design was followed from yard to yard : it was built everywhere and anywhere, local yacht and small craft manufacturers from the Isle of Bute to Mombasa being able to produce them, leaving the more advanced yards to the more complicated MGB's and MTB's. Engines varied due to local supply conditions, and armament was two twin 0.303" MG's and a single 2 or 3 pounder up front.
It followed MTB practice in adopting a standard 70 foot hull, but lacked the "hard chine" design because it was not designed for high speed, and this hullform complicated productionm, the round bilges being simpler to build. Because it was fairly slow, it was an extremely pleasant and easy to handle craft, and was extremely sea-worthy.