There are a couple of articles posted on Alan's blog "Mailstrom" which will be of interest to readers:
Building Profits versus Building Homes
How Socialism Can Organise Production Without Money
One of the arguments against Socialism is the so-called "Economic Calculation Argument." The Socialist Party was subject to criticsm from the Libertarian Alliance in the 1970s and after on precisely the ECA. One particular critic of the SPGB, David Ramsay Steele (and author of "From Marx to Mises", was in fact a former member of the party.
The Libertarian critique of Socialism led the party to look into its conception of Socialism; the result was a refining of the socialist case as well as a refutation of the ECA.