Paul - I found this re:Frank Withers Snr. I believe it matches up to your info: http://www.cwgc.org/search/casualty_details.aspx?casualty=46...
The Commonwealth War Graves website is very good for searching casualties and you can find out where they are buried. If I loose track of a relative and they were of age during one of the wars I always check this site. Sometimes, for obvious reasons, there is not much info.
Hope this helps