Thanks everyone for the very warm welcome to the forums!
Thanks for the suggestions on the all-purpose spice mix. For the recipe I've tried so far, chewytikka suggested a particular spice blend which was actually quite cheap and easy to produce. I'll certainly keep my eye out for others, though.
I'm still learning at this and I don't want to stray too far from the recipes the wise folks here suggest, in case I end up ruining a good meal!
I'll be interested to hear what everyone else thinks works best, though.