1941 Original Programme

The first twelve boats were ordered on 15 March 1941, becoming MGB 601 to MGB 612. Six weeks later, another 28 boats were ordered on 27 April 1941, as MGB 613 to MGB 616, and ML 617 to ML 640, although these MLs were quickly reclassed as MGBs. The prefix for all boats (except early losses 622, 631 and 639) was reclassed from "MGB" to "MTB" in September 1943.

Eight of these boats (nos. 618, 619, 620, 623, 625, 626, 627 and 631) were handed over to the Royal Norwegian Navy in 1942, manned by free Norwegian personnel and formed into the 30th MTB Flotilla under Lt. Ragnvald Tamber. After being worked up at HMS Bee shore base at Weymouth, they were based at Lerwick in the Shetland Islands, and deployed for numerous operations along the Norwegian coast.^[2] MTB 631 was captured by the Germans in March 1943 and replaced by MTB 653.

The last eight of the programme (boats nos. 633 to 640) were chosen for Mediterranean operations; they were worked up at HMS Bee at Weymouth before proceeding to Milford Haven, where they were formed into a new 32nd MTB Flotilla under the command of Lt. P. E. Stewart Gould; they were fitted with extra temporary fuel tanks bolted to the upper deck (raising their fuel capacity by 3,000 gallons to 8,000 gallons of 100 octane petrol for the long passage to the Mediterranean), and proceeded in groups to Gibraltar in March/April 1943.

1941 Supplemental Programme

A further 60 boats were ordered in November 1941, numbered from 641 up to 700, of which 16 ordered on 18 November had the prefix of "MGB" (numbers 641 to 648, 657 to 663, and 674), and 44 ordered on 28 November originally had the prefix of "ML" (numbers 649 to 656, 664 to 673, and 675 to 700), although the MLs were quickly reclassed as MGBs. All of these (except early losses) were reclassed as "MTB" in September 1943. However, from No. 697 onwards, the boats were classified as combined "MTB"/"MGB"s.

As with the final eight boats of the preceding programme, 24 boats were chosen for Mediterranean operations; they were worked up at HMS Bee at Weymouth before proceeding to Milford Haven, where they were formed into three new flotillas as follows (with initial flotilla commanders in parentheses):

• 19th MGB Flotilla (under Lt E.M. ("Mickey") Thorpe): boats nos. 641 to 648 inclusive.
• 33rd MTB Flotilla (under Lt-Cmdr Ronald R. W. Ashby): boats nos. 649, 651, 654, 655, 656, 665, 667 and 670.
• 20th MGB Flotilla (under Lt-Cmdr Norman H. Hughes): boats nos. 657 to 663 inclusive, plus 674 (although 674 only joined later).

As before, they were fitted with extra temporary fuel tanks bolted to the upper deck (raising their fuel capacity by 3,000 gallons to 8,000 gallons of 100 octane petrol for the long passage to the Mediterranean), and proceeded in groups to Gibraltar in March/April 1943.

Note: (a) 674 was the final boat ordered as a MGB, and is thus shown out of numerical sequence.

1942 Original Programme

Another 23 boats were ordered on 7 April 1942 as MTB 701 to MTB 723.

1942 Supplemental Programme

Another 48 boats were ordered on 30 August 1942 as MTB 724 to MTB 771.