Boothroyd was the principal compiler of the second edition of PMS Guide to Pressure Groups and PMS Guide to the 1997 General Election .
David Boothroyd , author of The History of British Political Parties , was a researcher at the company in 2001 .
researcher was the principal compiler of the second edition of PMS Guide to Pressure Groups and PMS Guide to the 1997 General Election .
David Boothroyd , author of The History of British Political Parties , was a researcher at the company in 2001 .