It looks quite interesting but I'm afraid I just can't say from photos on this one. Please email me on firstname.lastname@example.org if you'd like to arrange to bring or post it into the museum for a closer look.
This looks very much like a broken piece of stalactite that I found in a limestone cave in the Peak district many years ago. There are limestone outcrops and quarries in worcestershire. Search 'cut stalactite' in google images and compare with your specimen.