« Reply #10 on: Sunday 07 June 09 17:40 BST (UK) »
If you are going to Matlock then I would strongly suggest checking that the marriage you found on the IGI is correct. I assume the marriage was in Derbyshire.
It won't take long to check and then you can be certain of her maiden name before you begin searching. I have found more than one mistake on extracted IGI entries.
I have Frost links in Castleton - I think it is a Derbyshire name.
(Got rid of my typos now) 
The marriage is correct and Sarah's name is confirmed as Frost, will send a pm Alan
Shirl
North,Noble,Harrison,Seller - North Riding Yorks parishes
Brown,Brooks,Watson - Belper/Duffield Derbys
Hole - Ashover Derbys
Webb, Flavell, Mason - Staffs (mainly Sedgley)
Bevan,Beamond - Chirbury Shropshire
Longridge - Northumberland/Durham
Freeman - Hampshire, Oxfordshire,Sussex
Smith - Derbyshire and Yorkshire
Whitehead - Yorkshire
Morris - St Pancras Yorkshire etc