Having 2 lessons back to back was probably the best decision I've made so far. I feel like I've made an enormous amount of progress this weekend, going from complete incompetence to actually having a vague idea how to fly the aircraft!
Today we handled 'proper' climbs and descents, taxying (aside from going the wrong way and fumbling with the brakes I didn't make too much of a hash of this) and I even made a very nervous-sounding radio call although I'm convinced the subsequent silent pause from the controller was him trying to work out whether it was a genuine call or some prankster having a laugh

.
Thanks for the advice guys. The slightly 'OT' posts in this thread have been most informative too

.
Now for some light reading... in the form of the Air Law manual