a 1 The Supremacy of parliament Parliament can pass, repeal and alter any of Britain' s laws. this is one of the major powers that a government has Parliament also has the power- after going through its own parliamentary processes -of altering its own laws. In theory there is no body that can declare a law passed by Parliament as unconstitutional though the full impact of the European Court is not yet known. But decisions of the European Court must be accepted in UK.A 1 The Supremacy of Parliament ◼ Parliament can pass, repeal and alter any of Britain’s laws. This is one of the major powers that a government has . ◼ Parliament also has the power – after going through its own parliamentary processes – of altering its own laws. ◼ In theory there is no body that can declare a law passed by Parliament as unconstitutional - though the full impact of the European Court is not yet known. ◼ But decisions of the European Court must be accepted in UK