There are calls for the government to make affordable childcare a top priority.
The Daycare Trust Institute says London families continue to be hit hardest by the ever increasing costs of nurseries.
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The 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.