Just wanted to say thanks for the advice. I gave the second lesson today and it seemed to go OK. I tried playing hangman (for spelling names of numbers) and that seemed to go down well. I think in future I'll try to do half the lesson with the book and half that's more games, using physical objects to learn vocab and prepositions, etc. I found that exercises I thought might take 10 minutes took 20, so at least I know that for next time.
Can I ask a couple more questions?
1) is there a 'best order' to learn the phonetic symbols in?
2) Would you expect learners to know the present simple tense perfectly (within reason) before introducing them to the past and the future? Or would you teach them the present, past, future of some useful verbs (like, go, do, be, think) at roughly the same time, with the idea that they could then communicate more complex ideas and be more motivated to speak, but stick with present tense only for most other verbs?