Hi Sarah,
I found this today which probably explains it:
Cadmore End parish registers: christenings at Ackhampstead (Ashamptead)
chapel 1786-97, 1800-1812, christenings 1813-1912 (to 1837 described as at
Ackhampstead Chapel, from 1838-1852 at Lewknor up Hill, and 1852 Cadmore
End), marriages 1852-1971, burials 1852-1972, banns 1890-1949.[FILM SERIES
ENG BKM 4]
It seems Cadmore End and Lewknor Uphill are one and the same. Lewknor and Lewknor Uphill are different.
Best regards,
Pete