aug 4, 1842 - The Coal Mines Regulation Act was passed

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The Coal Mines Regulation Act was finally passed on 4 August 1842. From 1 March 1843 it became illegal for women or any child under the age of ten to work underground in Britain.
There was no compensation for those made unemployed which caused much hardship. However, evasion of the Act was easy - there was only one inspector to cover the whole of Britain and he had to give prior notice before visiting collieries. Therefore many women probably carried on working illegally for several years, their presence only being revealed when they were killed or injured.

https://museum.wales/articles/1013/Children-in-Mines/#:~:text=The%20Coal%20Mines%20Regulation%20Act,unemployed%20which%20caused%20much%20hardship.

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