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[Manic]

They employ loads, I didn't say they gave them all lots of hours. In fact the opposite, they run on a skeleton staff with short shifts (so they don't have to pay breaks)....

[Manic]

There are other reasons too.

Part timers earning less than 5k per annum don't attract NI rates.
Minimum wage for under 18 is lower than 21+

It's why most retail stores employ loads and loads of poorly paid under 21s on zero hour contracts....