I've just checked in the Pallot's Marriage Index 1780-1837 on Ancestry (UK) and found the following entry:
Rebecca Brown & George Goodwin. Christchurch, Newgate, London. 1829. The original image gives no further information other than the two names.
Could Rebecca Plumridge have been previously married to a Mr. Brown before marrying John George Goodwin in 1829? The date is very close to the baptism of Charles George Goodwin in Eton on 21 April 1830.
Jack