Have you seen this excellent & very recently revamped website ?.
Link is to the "Records Archives" page, hope it helps.

http://www.workhouses.org.uk/records/archives.shtml

This is the Ross page, re Records it states they're held at
"Herefordshire Record Office, Harold Street, Hereford HR1 2QX. Very few records survive — Relief order books (1915-24); etc." Still worth a try though.
http://www.workhouses.org.uk/Ross/