More info regarding the op:
After attacks of Squadrons No. 12, 105, 139, 150 and 218 came an attack by Blenheim squadrons of Uk based 2 Group. 21 Squadron, 107 Squadron and 110 Squadron tasked 30 Blenheims to bomb targets at Sedan and were provided with a fighter escort by the RAF and French Air Force. The aircraft of 107 Squadron all bombed enemy columns despite being subjected to moderate flak, which damaged five aircraft. All returned to base. 110 Squadron encountered Bf 109s and intense flak whilst making low level bombing attacks on enemy columns losing five of their number. 21 Squadron met similar opposition attacking pontoon bridges and troop columns. Two Blenheims were lost to fighter attack and another was written off in a crash landing on return to base at Bodney. The returning air gunners claimed several Bf 109s shot down.
Looking at the serial number under magnification, I personally believe it does read L8742.