Hi Mike
That's fabulous information, thanks again ...
If Arthur was 35 in 1813 he was born c.1778. That makes him most probably the Arthur Fawkes who was bapt. 17.2.1778 at Claybrooke, son of John Fawkes & Elizabeth Higgs (IGI). The older Arthur - who married in 1776 and died at Leire in 1826 - was John's brother. I'd supposed that John's son Arthur must have died young because he was not mentioned in John's will. If so, then maybe Arthur senior had a son Arthur c.1778 but if so he is not recorded in IGI (Arthur's eldest son in IGI, William Smith Fawkes, was bapt 2.12.1778 at Leire).
Meanwhile I found the following report of a court hearing at Leicester for insolvent debtors:
Arthur Fawkes, formerly of Great Claybrook Mill, Leicestershire,
Journeyman Miller, afterwards of Leir, Leicestershire,
Baker, afterwards of Leir aforesaid, Baker and Licensed Beer
Seller, afterwards Omnibus Driver to Mr. Till, of Little Harcourt-
Street, London, and late of Leir aforesaid, Licensed
Beer-Seller, and Working as Journeyman Miller, of Great
Claybrook Mill aforesaid.
Source: London Gazette, 26.2.1833.
Since Arthur Fawkes senior died in 1826 this can't be him, so it must refer to the younger Arthur who married Mary Hopkins.
So your information brings me a big step forward. The only question now is, is Arthur the son of John Fawkes or an unrecorded son of Arthur senior?
All best wishes
John