If you Google

A2a

This is the National Archives which shows where records are kept.

Had a quick look for HOPKINS of Hewlesfield and these include

Marriage settlement lease and release - 1776

Between James HOPKINS of Chepstow (Mon) - shipwright and Lewis WILLIAMS of Chepstow (Mon) Glazier

(Held at Gloucestershire Archives)

and

Morgage 1765

James HOPKIN junior formerly of Brockwear, Hewlesfield, now Chepstow etc etc - held at Gloucestershire Archives