Today I came across a reference to George Caswell in Slater’s, late Pigot & co., Royal National and Commercial Directory and Topography of the Counties of Bedfordshire, Berkshire, 1852. The entry was as follows:
Gentry and Clergy
Captain George Caswell R.N.
Botley Cottage
This may have been on Botley High Street as the 1851 census in the previous year lists his residence as High Street, Botley.