Candidates are subject to controls on the election expenses that they can incur in the period before an election. For the 2010 general election there were two regulated periods:
the "Long Campaign": from the 1 January 2010 to the date that Parliament was dissolved (12 April 2010), and
the "Short Campaign": from the dissolution of Parliament through to polling day.
The long and short campaigns have a baseline limit of £25,000 and £7,150 respectively, with a top-up of:
Candidates are required to submit an expenses return 35 days after the day of the poll to the Returning Officer. Expenses incurred by candidates are separate from political parties' expenditure, reported directly to the Electoral Commission.
If you had similar rules that actually worked, it would be a fairer game in Pakistan.
Anyone who breaks these rules in the UK, even by few pounds, loses their seat.
What might interest you is the sums involved, even by Pak standards, they are about 35 Lac rupees per constituency. (£25,000) why cannot we have similar limits, and then it really would be a fairer and affordable game.