One of the main attractions is Moot Hall . Other attractions include a Napoleonic Era defensive fort ( known as a Martello tower ) , a sheltered yachting marina , and two Fish and chips shops A popular weekend destination , particular attractions are the ancient Moot Hall ( where the town council still meets ) , Napoleonic-era Martello tower to the south , sheltered yachting marina at Slaughden , and two family run shops serving fish and chips , one of which is often cited as among the best fish and chip shops in the UK .