British Pathé film, Belton House in background during opening shots. The second link is to a video of a Vickers machine gun in use. This sound would have been audible here, because the firing range is under a mile away on the otherside of the A607.
Soldiers approach on motorcycles with side cars. Setting up machine guns. Men run back to cycles; start them and take off. cavalry march; pulling guns. a silly sport with mules -- guys try to knock each other off mule while staying on their own mule.