Keisha Buchanan, Mutya Buena and Siobhan Donaghy of MKS were spotted on the front row at the Sister by Sibling show at London Fashion Week.
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One firefighter has been killed and more than 700 homes destroyed in the 404-square-mile Thomas Fire.
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All workers over 18 will save into a workplace pension unless they opt out under plans to lower the qualifying age of auto-enrolment.