At Stanborough Park in Welwyn Garden City the River Lea runs fast, shallow and clear over a gravel base – and it looks absolutely gorgeous at the moment. You can stand on a bridge in the park and look at shoals of fish below you through the glassy waters. Pictured above is one of the larger specimens – about a foot long – which I think is a Barbel, as evidenced by the overall shape and colouring but particularly the barbels by the mouth. The clue's in the name!