Thanks for this speedy reply.
The marriage entry appears on a comprehensive family website dedicated to the Hebborn name (and all derivations of it), so I assume there has been a record traced. I know that Susanna's parents were Thomas and Rebecca (nee Tripp) from Bledlow in Bucks. Since Susanna married in Westminster, I am working on the assumption that Thomas Rolfe may be from there, hence my interest in the possible baptismal record at St George's on IGI. I know that Thomas had died by the 1841 census, as his wife is listed as a widow, so it is proving difficult to find any real links for him.
I will try to find access to Boyd's online. Meanwhile, if anyone else can help with info, that would be fantastic. I am helping a friend who has just started researching her tree, picking up on work her late mother began some time ago. She is unravelling several false leads, and has hit a brick wall on the Rolfe line!
Thanks.