I would not presume to tell you how to run your elections. Britain being a democracy, one must presume it is as the people want it to be. Or at least that they don't care enough to change it.
How can we change it? Considering that FPTP benefits the Big Two - Tories and Labour - do you think a Government of either blue or red is going to want to change it and let Farage's party become the third biggest in the Commons?