Did you mean just Brits? Chaucer's Canterbury Tales open with a lovely piece of nature writing. And there are some beautiful passages in Milton's Paradise Lost. (He's describing Eden, of course, but in reality it's the English countryside.)
Blake's poetry includes lots of vivid, intense, almost psychedelic descriptions of nature. Keats' odes contain some gorgeous nature writing as well. Have you tried Coleridge? I remember a lovely poem by him about watching his infant son asleep, and how the cottages were "smoking in the morning sun," or something like that.
D. H. Lawrence would be another obvious choice. Plus Thomas Hardy and John Clare. Even Philip Larkin, who is often thought of as a gloomy suburbanite, wrote some exquisite poems about the natural world. It may only be there in the background, but some of his lines are breathtaking. Actually, if you browse the canon, most of the great poets draw on nature – even Tennyson, Browning, Swinburne, Auden, Wilfred Owen, etc.
Oh, and John Betjeman wrote some lovely poems about the Cornwall. He also wrote some of my all-time favourite lines:
Damp down the kitchen fire,
Let out the cat, and up the lane,
Go paddling through the gentle rain
Of misty Oxfordshire