Hi Noody,
Looking on the Surrey Marriage Index (pre 1837) for Rebecca Harding I found,
Rebecca Harding otp married James Shakelford otp 8/1/1823 CHERTSEY. Otp= Of This Parish.
For the John Bennett & Rebecca on the 1851 at Shadwell, Stepney I found on FreeBMD,
John Bennett March quarter marriage 1847, Stepney (2 476)
on the same page is REBECCA FLYNN. Could be that same couple.
Jane