I haven’t actually been, but its high up on the list. The Essex estuary has a few of these oyster shacks, like its south counterpart Whitstable and surrounds. I think they range from sheds n shacks to fully fledged fish restaurants.
Mersea Island is home to the West Mersea Oyster Bar – not far from Maldon with its famous salt. Have a roam around the following links for some inspiration to get outta town one sunny Saturday.