To all of you - Annie, David, Biggles50 and Maiden Stone - thank you so much for your combined information and advice.
As yet, I have been unable to discover Banns or details relating to the marriage of John and Hannah's son, George, (my 3xGG) to Jane Waite, in I suspect, Penrith, in around the mid 1840s, which could throw light on his, by then, deceased parents.
The Hannah/Hanna/Anna Proud is a lead I will certainly investigate further, as is Military service. The death notice quoted has been a strong element in my past research - thank you for confirming this. Likewise confirmation of Census rounding up/down.
I have wondered about the 1806 birth of Mary/Mary-Ann Lamb to John and Hannah, as their son, George, and wife, Jane, named their children in exactly the same order: Mary-Ann; Robert; John; George and William. This George became my 2xGG and those very same names still figure strongly in my Mum's family.
It is also great to be joined on this search by a couple of members of the Lamb family. Love the signature photo.
Thanks to all ... best wishes ... John