Yes - Essex with its post 1965 boundary. I seem to recall when residence/place of birth still played a part in who you could play for that Havering, Redbridge,Barking and Dagenham, Waltham Forest and Newham were regarded as part of Essex for those purposes. JK's birthplace always used to be "Ilford" in Wisden but latterly changed to "Stepney" which meant he was born in Middlesex!
Mind you, coming from Castle Hedingham, as I did, anything beyond the A120 seemed like a foreign land to me!