Nissangaz - thats a pain! I know the feeling, lovely sunny day then the school ring to say the instructor is ill.
We should run a book see how many different excuses we get for not flying!
Don't loose heart, I've managed around 8 hours in the last 2 months and have half my R/T course out the way. In the previous year I'd only got 4 hours done.
Good luck with the air law exam, I have that...erm excitment..to look forward to!