Best of luck Binkas Mum!!
I have had 3 unsuccessful 50mg clomid cycles. But, I then had an HSG which cleared a tube, so that could've been the reason that it was unsuccessful.
If this cycles a bust (will know at the weekend), then I am starting another clomid cycle or two. Ihave the script, and I really hope I dont have to fill it! But think I probably will. 
Just watch those side effects! And warn your partner than you may be a bit crabby this month. lol. I hope not, but it can be pretty nasty stuff. And if you start having hot flushes, dont worry, its another normal side effect.
Good luck I really hope this is it for you!