Low Level Bombsight, Mark III use in October 1942. Coastal Command had priority on deliveries and only small numbers reached Bomber Command. The first examples arrived in May 1943 and were fit to Douglas Boston bombers of 2 Group. In 1944 the sight was trialled on the Avro Lancasters of No. 617 Squadron RAF, the Dambusters, who carried out a single low-level attack with them in late 1944. Most examples sent to Bomber Command equipped a small number of De Havilland Mosquito aircraft in No. 627 Squadron RAF (who normally operated as pathfinders) and No. 8 Group RAF (Pathfinder Force). The sight remained with Coastal
No. 342 Squadron RAF their sister squadron No. 88 Squadron to RAF Hartford Bridge. The squadron flew low-level bombing and strafing missions (nicknamed "hedgehopping"), over France and the Netherlands, in particular against V-1 bases in Northern France and selected sites connected with the preparation for D-Day. In October 1944 the squadron relocated to France from where it continued to support the Allied advance. In March/April 1945 the Bostons were replaced by B-25 Mitchells and the squadron relocated to the Netherlands. The squadron was transferred from RAF control to the French Air Force ( "Armée de l'Air" ) on 2 December 1945. No. 342 Squadron