What is a trade union and who is allowed to strike?
By Tom EdgingtonBBC News
BBCTougher rules for some workers planning strike action have been announced.
The government said it would ensure key services like the NHS are protected, but unions plan legal action.
How could strike rules change?Some trade union members would be required to continue working during a strike, under the proposed law.
This would be to ensure a "minimum level of service". It would apply to England, Scotland and Wales.
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