See this UK vote calculator, to see how much candidates spend in different areas. For some, each vote is worth as much as £3.07 (close to $5/€5), and for others as little as 14 pence (~10-20 cence). http://action.electoral-reform.org.uk/ea-action/action
“The funding scandals which have tainted all the big parties have involved a small number of big-name donors. But how is that money being spent? We have used publicly available data to show the different amounts of money spent by candidates in the 2010 election. The numbers show that when it comes to party spending at election time, all votes are NOT created equal. People who live in marginal seats have much more money spent on them than those who live in safe seats. And some voters in Britain are valued 22 times more than others.”