Hey Clouseau,
I used the Dyson Holland "Recreational" Texts for my Pilots cert and X-country. I found it was good info in a logical format and has lots of revision questions and sample test questions as well. It breaks all the learning into small sections in a logical sequence ie: pre solo air leg, followed by pre-local area solo, radio, BAK etc Its worth getting the HPL supplement as well.
Whatever you use will have the air leg basics in it, just it may be hidden in the greater font of knowledge rathyer than labelled as Pre-solo air leg.
Phil