The John Oxlade and Mary Anne (née) Terry that I've been researching apparently moved from Portsea, where they had married in 1813, to London at some stage around 1820. John's trade, at that time, was 'shoemaker' although later references have him as a bookbinder. There is a confused record of a son, Henry, born at that time. The couple went on to have other children - John Thomas, for instance, who followed his father's trade as bookbinder.
Does any of this 'fit' what you know? I'd be delighted if you have more information and if you felt it necessary to correct anything I've written.
roly