Welcome to rootschat, Sarah.
I am not related to any Horwell, but if someone is, they cannot reply directly to you yet as you have only posted once.
Have you looked in Surname Interests, under Your Tools, below, to see if anyone on here is actively researching Horwells from your area (wherever that is).
Is there anything specific that you would like any help with?
Added: Just looked for a George Horwell at Scotland Yard in the 1950's, can see a John Horwell there in 1930's, depends how high ranking he was, maybe.