Is there a database or something where I can find out where someone
works in London.  I have their full name, their home address and
telephone.  But would like to find out there work email.  If I could
find out the name of the company where they work I could get the
email.  Please advise.

I guess such a database would violate at least one dozen of British
privacy laws. Therefore, I doubt that it exists.

Scriptor

No there is no such database, since, as one of the previous
comentators has said: It violates British Privacy Protection and Data
Protection Laws as well as EU data protection laws.

That makes sense!  I just didnt' know if there was a place with the
internal revenue which you could access that information.

Thank you.