At the Mersea Island Community Centre, The Earl and Countess met local schoolchildren and members of the community.
Children from Mersea Island Primary School sang 'Happy Birthday' to The Earl - who turned 56 on Tuesday.
At the Wilkin and Sons, The Earl and Countess learned about farm to factory production.
Wilkins have farmed in Tiptree for almost 300 years: the estate produces unusual fruits such as medlars, mulberries and quince – as well as strawberries, raspberries, cherries and plums.
These fruits are then made into preserves and jams in the factory.
As a final birthday surprise for The Earl, Tiptree bakers prepared him a cake!