Hi Karina,
many thanks for your input. I shall keep the idea of Trades Directory in mind, in case I find a more specific area for my John.
Yes, the John you found on 1851 Census has been sent to me already but no mention of brother William being a painter. This John could definitely be in the 'consider' list. I looked in an atlas I have of Britian and found that Chudleigh is in Devon...so at least I'm in the right county.
RE: the DFHS site..I have been on so many site with wonderful information. but unfortunately some you have to pay for...which I fully understand. But since I use public access internet and my time is limited, it just doesn't work for me. BUT thank you for your searches and I shall keep this info on hand in case I find more resources to search.