Covid ambassadors - council staff and police carried out checks at caravan parks in Tendring. Picture: Tendring Council COVID marshals in Tendring have been checking up on caravan site visitors to find out whether they are allowed to be staying there under strict Covid-19 travel rules. The coastal distict has a large number of caravan sites and attracts tens of thousands of visitors every year. Park Holidays has four caravan parks in the district, including Dovercourt Holiday Park, Seawick Holiday Park, St Osyth Beach Holiday Park and Martello Beach Holiday Park, while Parkdean runs Highfield Grange, Valley Farm and Weeley Bridge in Clacton, and Naze Marine in Walton.