Left and Right for political beliefs were coined during the early part of the French Revolution. The terms referred to the seating arrangements in the French Legislative Assembly of 1791, when the Royalist Feuillants sat on the right side of the chamber, while the radical Montagnards sat on the left.
Putting that into today's context is fraught with difficulties as individual politicians use surprising "window dressing" to garner support for more entrenched policies. David Cameron will appear like some latter day hippy and get friendly with the Earth, throwing the present government's actions into question, but the Tories remain right wing and will hammer us all as such if they ever get into power.
Those who bewail the current government's betrayal of its "working class" roots should consider the change in the prosperity and aspirations of today's working class, and the destructiveness of the militant Trades Union petty carnalities, while being appropriate to industrial bargaining, being utterly unsuited to the broader political stage. By espousing pragmatic policies in terns of supply and demand, with a view to equitable rewards within society, a Labour government serves the people. Its foreign policy should not only reflect that pragmatism, but also ensure the liberty and prosperity of all citizens. In essence left wing is the intervention of the government on behalf of the poorer in society, and an opposition of aristocratic, royal, or clerical interests.
Right wing beliefs are characterised by exclusivism, a wish to favour those more powerful and wealthy members of society by tilting economics and power in their favour at the expense of the remainder. Right wing politics is also characterised by nationalism, isolationism, and in extremis, race, gender and sexuality hate. Left wing beliefs oppose all that, and aims at delivering rewards and prosperity more equally shared, and espouses inclusivism in all policies.