Hi,
When I started this thread, I was researching a friend's family history and the Kelletts of Longsleddale are her ancestors. Unfortunately, I seem to have wiped the information from my lap-top after printing it for her ( or I have stored it somewhere safe!

) So I don't at the moment, have a record of a Thomas, born 1823.
There is a Thomas Kellet, aged 20, ag lab in 1841, He is in the household of John Thompson at Burton House, Grayrigg. This being 1841 and therefore rounded down in age, he could actually have been a little older. Do you think this is your man?
If I can find my own Kellett notes, I'll get back to you.
Jen