I have recently made contact with Dave Poissant, who is researching the Leighton line from Seaham Harbour. The Leightons originated from Newcastle, where George Leighton was born in 1809. George's parents were John Leighton and Barbara Wilson.
Interestingly, the Leightons, although moving to Co. Durham, did not work in the mines. They were glass bottle makers!
Dave is a 3rd cousin twice removed to my husband, Andy.