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I would like to suggest the removal of the following.
It is thus claimed that during periods of heavy rainfall Norfolk can be considered to be an island.[citation needed] The explanation of this oddity is that the valley in which the rivers rise was formed, not by these rivers but by water spilling from Lake Fenland.[citation needed] This was a periglacial lake of the Devensian glacial, fifteen or twenty thousand years ago. The ice sheet closed the natural drainage from the Vale of Pickering, the Humber and The Wash so that a lake of a complex shape formed in the Vale of Pickering, the Yorkshire Ouse valley, the lower Trent valley and the Fenland basin. This valley was its spillway into the southern North Sea basin, thence to the English Channel basin.