I'm finding there are numerous John Clarksons listed in the census images but none of them are showing as having been born in 1789 in Tatham. I'm just wondering Jim if you have any information on what John's occupation was. How have you discovered his year and place of birth - a certificate of some sort? If so, does it give an occupation for him - a marriage certificate should. Any other snippets you have may just point us in the right direction.
I've found Tatham is a little hamlet just south of Kirby Lonsdale, whilst a John Clarkson I have located born in 1789 was born in Poulton le Fylde but this is just north of Blackpool - too far from Tatham I feel to be the same John.
Perhaps you'd get back to me on this one and it might give another pointer for me.
Many thanks.
Kay
Manager