[PW] Need British Wombats again

[Donna Halper]

I am seeking a reference book that is the equivalent of the City 
Directory,  for London England back in the early 1920s -- something 
with the names and addresses and phone numbers of businesspeople.  I 
need to find out where a certain radio engineer was working in 1923 
or 1924 or even 1925.  If I can't find his business address (radio 
back then would probably have still been listed under "wireless"), I 
can possibly derive enough information from his home address, but 
business would be ideal if anyone knows how I could find it.  His 
name was Alfred Edward Cecil RYALL (sometimes referred to as Alfred 
E.C. Ryall), who owned a company that manufactured radio receivers 
and radio parts.  I have seen his company referred to as R.M.C. or as 
Ryall Manufacturing Co.  One of the products it made for early 
wireless sets was low frequency transformers.  The reason I am asking 
is his son, also a radio engineer and now long since retired and 
living in Spain, recalls as a boy visiting his dad's London factory 
and watching him and his staff making the sets.  He even found a rare 
photo of his dad at work.  But he cannot recall where in London the 
company was located.  Any idea about how to find this information 
would be deeply appreciated and would make an 80 year old guy very happy.