At the National Archives I was looking through MUN 4/5850, "Guarding of buildings at aerodromes awaiting disposal", when I came across a long list of "RAF stations for relinquishment or disposal up to 30/6/19". They appeared to be mostly minor establishments, but I was surprised to see that "Market Lavington landing ground" was included, Market Lavington being a small town on the northern edge of Salisbury Plain.
I thought I knew my Wiltshire WWI airfields, but this was a new one on me. I consulted Rod Priddle, author of the 396-page Wings over Wiltshire, which implied that there was a landing ground near Market Lavington early in WWII, but it was subject to air pockets, leading to its closure and a transfer of operations to New Zealand Farm by October 9, 1940. He was unaware of a WWI landing ground there.
There were two WWI landing grounds at Tilshead, four miles to the south of Market Lavington.
Any information will be very welcome. There are a number of AIR 1 files that may be worth my while consulting next time I visit TNA, but I wonder if they will have much to say about what would appear to have been a very modest facility.