Creaking Door
The weapons were practice bombs filled with concrete. Apparently there are some old fins still sticking around in the hedgerows here(ask the farmer first).
The bomb dump you mention is in Salcey Forest. The bombing range was in open country to the north east of the Werrington roundabout(Olney to Wellingborough road)
The original enquiry did not specify any time dates and this is all relevant aviation history that may interest a lot of viewers.