Experience is the payment
A: If this is a one-off, I don't see why you should be paid. You should expect your lessons to be covered when you are teaching all the Year 9s. You shouldn't face lots of extra work for helping the school out, even if it improves your profile. Even under the old regime of management points, I don't think that delivering drugs education to Year 9 would have qualified for a point. It will not under the new Teaching and Learning Research programme (TLRP) framework (introduced from next year). If you do the training outside school hours, claim travelling expenses.