170 aircraft either failed to return .
170 aircraft either crashed during the operations from RAF Downham Market ; 109 Stirlings , 40 Lancasters and 21 Mosquitos , including Mosquito KB364 which crashed on Bawdeswell church .
170 aircraft either failed to return or crashed during the operations from RAF Downham Market ; 109 Stirlings , 40 Lancasters and 21 Mosquitos , including Mosquito KB364 which crashed on Bawdeswell church .