Jo,
Don't know if you have this yet...
Marmaduke Robinson mar Frances Crabtree 29 June 1813, Belton
I just got the Isle of Axholme marriage indices.
John
I'm going to have to have a look through the parish registers to confirm all this, but using the IGI and familyhistoryonline I've found out loads thanks to your bit of information.

Frances was baptised Dec 14th 1787 at Crowle, daughter of George Crabtree and Elizabeth Savage.
George Crabtree (1768-1857) was, if I'm right, baptised and buried at Belton in Axholme and his parents were William and Alice Crabtree.
George Crabtree married Elizabeth Savage Nov 25th 1787 in Crowle (not much time between the marriage and Frances' baptism on Dec 14th 1787

). Elizabeth Savage was baptised April 23rd 1769 in Crowle, daughter of Thomas Savage and Frances. There's a possible burial for Thomas in 1815 in Belton which would place his birth at around 1746.
This has given me so much more information and taken me back two further generations. I can't thank you enough.
Jo.