You may be lucky and someone on this forum knows something about Walter.
The alternative is to obtain his death certificate.
You can search on-line here....
http://www.1837online.com/Trace2web/..._1837-1983.jsp
Note : There are some costs associated with this.
After that you should be able to search for any newspaper articles, obituaries etc
http://www.bl.uk/collections/newspapers.html (based in London)
Check if you can search newspapers on microfilm at a library in Accringtonocal Libr.
Hope that helps.
Good Luck.