US Defence Secretary Chuck Hagel will announce later today a plan to boost U.S. missile defences in Alaska to react to any potential threat from North Korea, according to a US defence official.
Hagel is due to speak at 3pm local time, 7pm GMT.
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Mayor of London Sadiq Khan is backing the scheme.
Sunday will be a fine day across much of Scotland and northern England, with much less coastal mist and low cloud than yesterday.
A spokesperson said the lightning strikes had left the "aircraft fuelling system unavailable."