Source: Journal Of The Royal Statistical Society, Vol. 56, P. 221; And "The Statist": February 1913 - July 1914, January 15, 1921, P. 89; January 16, 1926, P. 87; And Following Issues.
This NBER data series m04062 appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04062
Release: NBER Macrohistory Database
National Bureau of Economic Research, Wholesale Price Index, Total Food for Great Britain [M04062GBM313NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M04062GBM313NNBR/, November 27, 2015.