At Elias, a completed Chevron operation, the only sound to disturb the replanted clovermeadow is a faint whooshing as gas passes to an underground pipe network.
On half a hectare of sloping clovermeadow rises a surreal construction of dozens of red towers, conical as beehives, some of them four or five stories high.
On the high point of the first, Edburton Hill, are the earthworks of a motte-and-bailey castle, which in spring and early summer are a knee-high wildflower meadow: agrimony, wild mignonette, red clover, yellow rattle, marjoram, scabious, knapweed and the odd tall bolt of fireweed, through all of which wander string-like stems of bindweed.