Blenheim crash Sarre Thannet help required

Hello can anyone help in regard to a Blenheim aircraft crash at Sarre in Thannet which is near Manston airport Kent. the reason being I acquired a board full of relics from this aircraft, the only clues i have is one id plate of which follows serial no AD/3271 DRG no 48337/39 Date 19/5/40 ins stamp circled R2 400
there is also some ammo stamped 1938, so i would think was a mk1 Blenhiem. any help would be much appreciated cheers.