Bevanism was a political ideology associated with Aneurin Bevan, the former Deputy Leader of the Labour Party, and the faction within the party in the late 1950s known as the Bevanites. Central to Bevanism is the advocacy for the establishment of a 
robust welfare state, exemplified by initiatives like the creation of the National Health Service (NHS), which Bevan himself played a pivotal role in championing. Bevanism is generally considered to be on the left-wing of the Labour Party and was opposed to the Gaitskellites, who were moderate social democrats at the time. These two factions no longer exist though, with the Bevanites splitting over the issue of nuclear weapons after Bevan died in 1960.
Beliefs
State Ownership
One of the main objectives of Bevanism were 
state ownership of the "commanding heights of the economy" (strategically important sectors). These policies of nationalisation, according to 
wikipedia, mirrored those of 
Vladimir Lenin, in that state control was only seen necessary in the context of exchange or distribution, as opposed to the total and immediate appropriation of as much private property as possible.
An example of a to-be-nationalised industry for the Bevanites would be the steel industry, this belief being contrary to many colleagues in the party.
Housing
Full Employment
Foreign Policy
Bevanism was skeptical of 
American foreign policy, especially to the introduction of the 
Southeast Asia Treaty Organization and the rearmament of 
West Germany.