It is Dimsie Moves Up Again, and unfortunately that is the only mention of rioting that there is. Meg Flynn has now left school, taking her occasional brogue with her, so I don't think there'll be more, either.

Also, thank you for recommending Maeve Higgins' Fancy Vittles! I am enjoying it very much, and I keep meaning to go and find out more about the person who's singing the opening music.