Starting Giving Flyers Tomorow, if there is no Contract to a Work, It's Not Binding is it?

It’s a student job. Only 3 hours a week, and i’m gone (already wow) from the uk in 3 months and hte pay is around 7.5 pound an hour. The money from the events go to the people in the community in need. But I am a little uncertain about that as they are not working with an association specifically (uncertain?)...