The area of Caerlon and Christchurch are a little out if the scope of the Forest of Dean. There is a Christchurch in the Forest but it is a different place to the one that is near Caerlon and Newport.

Unless the family has some connection to the Forest of Dean, you would be better suited to seek assistance from the Monmouthshire Family History website.
http://www.monfh.org.uk/