Can you help me to trace my two cousins in Eastbourne?

I am Raymond Thomas Riches, and was born in 1936 in Ipswich, and still live in Ipswich.

Since retiring I have been tracing my family.

I was orphaned in 1948, and lost contact with two cousins who were born in Eastbourne and I believe may still live in Eastbourne district. Can you please help or advise me how or where to find them.

My mother’s brother Harry Calvesbert, in the 40s/50s lived in a flat over Martin’s Bank, where he worked, it was on a corner of a main street not far from the railway station, where I visited for two weeks in October 1945.

He had two daughters, my cousins, which I am trying to trace: June Calvesbert, born 1933 in Eastbourne.

Information I received from a distant relative is that she married in 1953 in Eastbourne to Stephen Barker. Rosemary E Calvesbert born 1939 in Eastbourne and it appears that she married John A Creed in Eastbourne.

Thank you for any help or advice you can give me.