Oliver-from your description, and your location, I am sure that your snake is the common UK grass snake. This is related to and ecologically similar to the common US garter snake. It probably feeds on those frogs, but since they only eat about once a week its not likely to put a huge dent in the population. Hopefully, it also eats slugs..the garter snake here in the US won't, but some of its relatives do. At any rate, its harmelss, and if it bothers you I would just suggest grabbing it the next time you see it, and releasing it some distance away from your greenhouse. Take care, Eric....not much in bloom other than Paph Berenice and Maelstrom and a Lycaste hybrid...in Queens, NY, overtaken by Asian tiger mosquitos.........
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