Britain's current electoral system means voters in marginal seats are the ones which decide the election. (politics.co.uk)
Ask most people whether our current electoral system is fair and they will tell you no. (politics.co.uk)
Since the current electoral system is the same to all candidates, and all candidates agreed to these electoral rules, it is better to talk about the «particularities» of the system and how these affect candidates; in fact all of the candidates try to use those rules to their advantage (by courting swing states, etc.). (politics.stackexchange.com)