Derek,
Thanks so much for the info. Roger is the third born son, preceded by John and Thomas. (Thomas being Henry's father's name). This is why I thought Roger may have been named after Ann's father.
I just did some hunting around and found a marriage on familysearch of a Roger Gillibrand to an Alice Fleming 28th Dec.1773, Blackburn. The names, date and area fit, maybe I'm just getting too hopeful and a little carried away...
Will now check out that website you gave me.
Thanks again,
Deb