While searching through a film for St Mary's Lambeth in London, I came across the following Banns for a marriage which I thought might interest you.
1815: Banns for marriage between William Brooks, a Widower to Mary Acklan, a Widow, both of this Parish on the following dates. Sunday 9th July, Sunday 16th July and Sunday 23rd of July.LDS Film Number 1041666. I dont know if this helps at all.
Just for interest my Mothers maiden name is Ackland and her family lived in Bethnal Green, London but origionated from Hemyock in Devon. I have traced them back to 1747 so far.