Hi Stuart,
Thank you for your submission to the index. I am afraid I didn't have your man already. Obviously Johnson is a very frequent name so it's likely that the names I do have on the index are connected, however, for what it is worth, here they are:
William Johnson, London, supplying corks to Petworth House in Sussex up to 1760.
James, working in Liverpool in 1807 - don't know if he is a master or journeyman.
James, working in Manchester, iin 1911 - a master.
William, working from the High St. in Bromsgrove Worcs iin 1828 - a master.
Do let me know if you find details of his father's name.
Best wishes
Cheryl