Welsh Liberal Democrat leader Kirsty Williams says scrapping the tolls on the Severn Bridges would cost the UK Government around £15m a year once the construction bill is paid in 2018 and debts associated with the bridges are settled.
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The turtle broke records when she was found to have landed in British waters after being carried over 8000 miles.
Barry Rogers is on trial along with his mother for the murder of his 84-year-old grandmother Betty Guy in 2011.