MaizieD
^Socialism An economic and political system where the community or state owns the general means of production (i. e. farms, factories, tools, and raw materials.)^
Is that what Dr Google told you, Pippa? Because that is how I would describe Communism. If that is the true meaning of Socialism (though I suspect that it is a US take on it) then I would never subscribe to it.
I see Socialism as a halfway house between Communism and your definition of Social Democracy, i.e. where the state owns and manages the monopolies which contribute to the citizen's health and wellbeing, such as health & social welfare, water, energy, public spaces, some cultural institutions, education and public transport while goods and services are provided to state owned institutions and to citizens by private enterprise. A mixed economy.
(Sorry, couldn't do it in three lines!)
I'm not sure where Liberal Democracy fits in. Is it something to do with less state control of things like utilities?
Maizie, I think you are beginning to define what I could not, i.e., Labourism. I went for the two as there are, to me, two very disparate groups with very different fundamental beliefs.
Dinahmo, I was trying not to have an opinion but put forward what they felt they stood for. What they are "selling", perhaps. I included "Libertarianism" as I think it is the other strand of the Conservative Party in the same way that they are two opposed strands in the Labour Party. In both cases, some will overlap in the middle but I thought it would be interesting to work out what was fundamental to each group rather than what we might think of them. (I hope that makes sense 
I think each party is made up of more than one group, each putting forward more than one creed.