Saltmarsh on the Severn estuary at Portishead, Somerset. Specialist salt tolerent plants can grow if they are only inundated during the Spring tide...

Saltmarsh on the Severn estuary at Portishead, Somerset. Specialist salt tolerent plants can grow if they are only inundated during the Spring tides. A tidal barrage might destroy the conditions that allow this unique habitat. The Welsh coast is on the horizon