Click here to see a report by ITV Anglia's Emma Hutchinson.
The city of Norwich was one of just a handful of places in the Anglia region where voters backed Remain in the Referendum.
Clive Lewis, chose to defy Labour leader Jeremy Corbyn, saying he had to listen to his constituents and his conscience.
Below is his resignation letter in full.
But resigning has not done his future career prospects any harm - bookies are tipping him to be the next Labour leader.