Pupils at Morriston Comprehensive School told ITV News the introduction of unisex toilets allowed them to show how mature they are. They said teachers monitor the loos to make sure no one is bullied.
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The pit closed in 1996 with the loss of hundreds of jobs.
Pollen levels will remain moderate tomorrow and Tuesday, but will be lower on Wednesday.
It will be a dry evening for most. A band of rain and thicker cloud will spread from the north overnight, clearing in the early hours.