Because then the political parties can't parachute inexperienced candidates into safe seats so that:
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The new candidate gets elected in a safe seat and learns the ropes of political life as an MP.
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More experienced candidates can be deployed to marginal constituencies to contest the seat.
Oh fuck off, people will still come to walk even if there's pylons. Theres pylons over a walking route I take and I see loads of people there. Plus the newer design looks a lot better than the older ones.