How much does it cost in £/science-joke to tell them at schools?

Question: How much does it cost in £/science-joke to tell them at schools?

Asked by daviessem to Lorna on 18 Mar 2010 in Categories: Money.
- Lorna Houlihan answered on 18 Mar 2010:
  
  Not that much. But it costs money to get to the schools, to buy props – such as a model brain, games to explain DNA and so on. But it’s good value because once I have all the stuff I can use it in lots of different schools! Don’t worry – I would not run away with as like everything else I do, I have to show receipts for everything.

Question: How much does it cost in £/science-joke to tell them at schools?