Seed Merchants, Swainseeds, JS Ltd. Seal

JS Ltd. Seal, Image by StuE, Found by Doug Turner.
Found in Somerset, 18mm, 6.0g.

J.S. with LTD. beneath on one side and a double triangle on the other.

This mark is identical to that used by the seed merchants - Swainseed. Perhaps J. Swain Ltd.?