The following are the purposes of general elections:
1) To select an MP to represent the constituency as a whole and us as individuals if we have a grievances against the state
2) To provide a verdict on the performance of the government. Voting for the candidate that belongs to the ruling party indicates satisfaction, whilst voting for a candiate of another party/ abstaining alltogether indicates dissatisfaction. For example, in May 2010 the Labour Party got very few votes.
3) To choose between different party programmes by reading party manifestos