Southend-on-sea May Bank Holiday Monday.   Beach welfare officers keep a close eye on the public at Southend-on-sea beach. By midday coast guards had already reported several people in trouble - The mudflats of Southend-on-sea lying on the Thames estuary, are notorious and people often don’t take account the low-tides. A loosening of social distancing measures by the UK government during the Coronavirus outbreak, had resulted in people flocking to the Essex seaside resort as temperatures reached 25c. during the May Bank Holiday Monday.