How much pocket money for a school trip

[cherrypickles]

I'm running the trip for 14/15 year olds
They have been told to bring packed breakfast and lunch for day one so service station stops on the way and shopping centre are optionall evening meal, breakfast and lunch are providers.

Service station
Shopping centre
Hotel overnight
Tourist tat shop
Services on way home to purchase evening meats

What is a minimum
Realistic not including shopping money?

Min £20 (services are expensive) plus they’ll want something else during a couple of days for sure! Max £50 (suggested)?