Min wage for U18 is under £4 an hourNice to see you Al. The catering staff seem to me to be overwhelmingly kids in a Saturday job. Are they covered by min wage? .
National Minimum Wage rates - GOV.UK
Good employers pay them more than that though. (I'm sure my laddies got a £5 an hour IIRC at U18)
Statistically most U18s are now expected to be in full time education or training and so it generally does mean if they are working it is in a "Saturday job" or similar. As you say, that's a Cowshed debate.
PS I am sure the catering is an outside contractor and not Hibs directly - so who is the employer?