Introduction

Abstract

For almost 50 years I have lived close to the Thames estuary (Figure 1.1). In the early 1950s, from our flat in Pimlico, we could walk along the embankment opposite Battersea Power Station. At low tide, the exposed mud had large red patches caused by the haemoglobin in innumerable tubificid worms. These formed the basis of a minor trade. Men with waders and sieves would collect the worms and sell them to the aquarium trade as food for fishes. The superabundance of these worms depended on the gross organic pollution of this reach of the Thames.