Banstead Library and local bookshops sell Memories of Wartime Banstead District by Banstead History Research Group (check their website) - the inside front cover shows a map of Banstead old Urban District Council area with plots shown for all types of bombs that landed in the area including all high explosive, all incendiary, crashed aircraft and of particular interest to you the 37 V1 and 2 V2. Seem to remember seeing this map on display in Banstead Library at one time - may still be available by prior permission.