Upside-down Toffee Apple Brownies

I normally like to bake Todd something special at the weekend. Usually it is a cake, but we already had some cake in. (I bought a lemon loaf at Costco on Thursday.) 
 
I thought maybe some  muffins or squares.  Then I picked up this book and went looking through.  Its a cookbook I picked up at Marks & Spencer a while back.  The recipes in it always turn out. So far not a ...