Its a wasted opportunity both to provide good food and to make money, given the excellent location and cafe decor which is really nice. I sent back a lasagne last week as it was really diabolical. Even if free it would have been lousy value.
It should not be too difficult to make decent sandwiches or basic lunches - the cafe in Dulwich Park does a good job and people know that at least their lunch will be edible. Why put up with c**p. The French wouldn't.