We are all accustomed to loosing money down the back of the settee/sofa/couch...
But, in this game, when the classes misbehaves or gets a question wrong, the loose five whole English pounds! And it doesn't just stay hidden behind the cushions for a rainy day, it gets eaten by Quid the Squid lurking below the floor in his watery world!
There are ten £5 notes, totalling £50 in total, so your class has ten chances to get the questions correct or behave well, before all their money is gone!