Hi
I actually meant William the policeman but now you mention it - I couldn't find his parents William & Harriet either in 1851 let alone 1861 so you may be right about the early deaths
thats what ive found re William the policeman,he"s listed on the 1881 census,gone by the next one.
As for his mum Harriet....i think i may have found her in the 1871 census,living as a lodger in Westbury.
Not definite its her yet though.
Thanks again
Chris