Reynolds' "Home Waters MTBs at War" says "there were only two major actions during May 1942, even though patrols were mounted almost every night". Actions are described on 11/12 May involving MGBs 41, 46 and 67, and a second action on 13/14 May involving MTBs 219, 220 and 221 and "two MGBs of the 2nd Flotilla".
The latter is described as "a very gallant battle" in which an armed merchant raider (Stier) escorted by "four Moewe class Torpedo Boats, eight M class Minesweepers and ten E/R boats" was attacked by boats from Dover. Apparently "the official record is extraordinarily lacking in detail" but the attack achieved some success at the cost of serious damage to MTB 220 (including the death of its CO). Reynolds goes on to say that "post-war Intelligence reports from Kriegsmarine records reveal that two Torpedo Boats - Iltis and See Adler - were sunk, although Stier successfully reached Boulogne".