Protesters near Mark in Somerset have vowed to continue fighting plans for new 160 feet high pylons due to run from Hinkley Point to Avonmouth.
This is despite National Grid's announcement that the new route will be further away from their homes than the existing line.
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Some showers are likely to affect southern coastal parts overnight.
It should remain mostly dry, but will be chilly in places with some frost.
Nearly 750,000 cars failed the emissions tests since May 20.