Robert Cundy B 1813 Suffolk UK

I am looking for ancestors of Robert Cundy Born 1813 or 1818, at Suffolk UK, who was convicted at Essex, Colchester Quarter Sessions for a term of 7 years on 24 October 1831. He was transported on "Lady Harewood." to New South Wales, Australia in 1832. He was released in 1840, Married in 1852 and died in 1894. Robert is my Grt/Grt/Grandfather and while I have his descendants tree would love to expand into his ancestors.
His parernts were probably George and Sarah Cundy. (Sarah's maiden name unknown.

Any info would be much appreciated. Many thanks in advance.