▁by ▁Norman ▁Hart ▁of ▁Fair mile ▁Marine ▁for ▁the ▁Royal ▁Navy . ▁An ▁intermediate ▁design , ▁twenty - four ▁boats ▁were ▁built ▁in ▁ 1 9 4 1 ▁receiving ▁the ▁design ations ▁M GB ▁ 3 1 2 – 3 3 5 . ▁ ▁Design ▁The ▁Fair mile ▁type ▁C ▁was ▁a ▁reuse ▁of ▁the ▁h ull ▁form ▁of ▁the ▁type ▁A ▁but ▁with ▁the ▁less ons ▁learned ▁from ▁the ▁type ▁A ▁incorpor ated ▁in ▁terms ▁of ▁ste ering ▁and ▁deck ▁layout . ▁ ▁Service ▁Five ▁boats ▁of ▁the ▁twenty - four ▁built ▁were ▁lost ▁to ▁enemy ▁action . ▁ ▁The ▁class ▁was ▁mainly ▁involved ▁in ▁close ▁esc ort ▁work ▁with ▁east ▁coast ▁con vo ys , ▁and ▁some ▁boats ▁were ▁engaged ▁in ▁c land est ine ▁operations . ▁M GB ▁ 3 1 4 ▁took ▁part ▁in ▁Operation ▁Ch ari ot , ▁the ▁d aring ▁ra id ▁on ▁the ▁St ▁Naz aire ▁do cks ▁( the ▁only ▁facility ▁on ▁the ▁axis - h eld ▁Atlantic ▁coast ▁suitable ▁to ▁ref it ▁s ). ▁ ▁Only ▁two ▁surv ive ▁to ▁this ▁day , ▁one ▁at ▁Hay ling ▁Island ▁and ▁the ▁other ▁in ▁B em bridge ▁Har bour , ▁Is le ▁of ▁W ight , ▁although ▁now ▁s unk ▁and ▁due ▁to ▁be ▁broken ▁up ▁ 2 0 1 8 . ▁A ▁third ▁surv ived ▁in ▁Sh ore ham ▁until ▁ 2 0 0 2 . ▁ ▁See ▁also ▁ ▁Fair mile ▁A ▁motor ▁launch ▁ ▁Fair mile ▁B ▁motor ▁launch ▁ ▁Fair mile ▁D