I've given up trying to search the transcriptions on Ancestry so set about working my way through the actual images for the place I wanted. Only 106 pages to look through. It was worth it though I found my Frederick Crumb as Robert Frederick Croombe. On the way, I found this little snippet I've attached. The vicar was clearly put out as he added similar notes for an 1853 and an 1860 baptism for the same couple's children. Useful information for me though.