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"A pudding really shouldn't reduce a child to tears," says Judith Morris, recalling her school days in Harrow.

One method advocated by some schools included magnetically locked mobile phone pouches which cannot be accessed until the end of the school day.

Others find decoys to place in their pouches, pocketing their real devices for surreptitious use throughout the school day.

She alleged the school only allowed him to "attend school for two hours per school day and in a 1:1 segregated setting".

It also wants the Welsh government to keep following the evidence of studies into the impact of smartphone restrictions during the school day.