Spiers and Pond
Group From 1855 To 1957
This Ruislip website refers to a lost S&P war memorial and gives some historical information, stating "They were well-known wine merchants and railway caterers as well as owning their own restaurants."
The start date given for the company is approximate.
The Daily Screw provides some information about Messrs Spiers and Pond, and the text of a W. S. Gilbert ballad which lauds the S&P restaurants.