Hedgehog, Mousetrap, and coastal anti-submarine craft

Were Hedgehog or Mousetrap anti-submarine weapons fitted to motor torpedo boats and Fairmile craft?

Hedgehog was not identified on British MTBs, while Mousetrap was fitted to American-operated subchasers of Fairmile ancestry rather than British boats.

No Hedgehog fit is identified on British motor torpedo boats, and their pack operations may have reduced the need for one. Their anti-submarine purpose was often to drive a submarine away rather than secure a kill. Mousetrap was a smaller rocket weapon used by the United States Navy and Coast Guard. American-operated subchasers of Fairmile ancestry could carry it, but British coastal boats are not given a Mousetrap fit. A shared hull family did not imply identical national weapon fits or doctrine.