Registration on the Scottish Progressives website requires that you accept and endorse the Statement of Principles of the Scottish Progressives, as follows:

"The Progressive Party exists to build a free, open and prosperous society guided by the values of economic and social liberalism.  We promote individual freedom and responsibility, self-reliance through the family and the minimum of government consistent with the achievement of these aims. Internationally we seek to extend free trade, promote human rights and freedom of conscience, encourage the development of free societies and create a more secure world in which liberty and the rule of law can flourish."

Membership of the party is also subject to acceptance of these principles, and you must also confirm that you are not a member of any other political party unless specifically approved by the Scottish Progressives.  Membership is subject to payment of an annual fee.