The Parliamentary Vote Value (PVV), which is used in the counting of parliamentary votes on party political issues, is the key to how DPR Voting balances the votes for the various parties with the number of elected MPs in the House of Commons. (dprvoting.org)
To put it another way, the Party vote vests the voting power for party political issues in the parliamentary party, not directly to the party sponsored MP. (dprvoting.org)
He points out the key relationship in ministers» offices is between private secretaries and the SpAds, who deal with party political issues, although these overlap with the purity of policy. (totalpolitics.com)