I want to know the answer to the following question:
What are "independent" theatre productions at Eton?
All the background I'm provided with is that "There are about 8 or 9 house productions each year, around 3 or 4 "independent" plays (not confined solely to one house, produced, directed and funded by Etonians) and three school plays, one specifically for boys in the first two years, and two open to all years.". Is that enough to answer the question?