I sympathise with you, Sherr. My little'un has had them numerous times. Thankfully, touch wood, the boy has yet to have them.
Anyway, I've tried loads of products. First solution is quite good, as it only takes 10 minutes, so you can put it on whilst their in the bath, and then wash it off at the same time. You then have to comb through with the (included) nit comb... which is the hardest part. Mine has really long hair too, so it's not the easiest of jobs... and usually ends in tears :-(
I recently tried "headrin", which was useless. It says you put it on, in mousse form, at night and then wash it out the next day with no need to use the comb. Absolute rubbish. She was scratching her head the very same afternoon!
I find tea tree oil is the best thing. I bought some neat, from Holland and barratt (cost a couple of quid) and mixed it in with her conditioner.
Do as the others have suggested, and put loads onto their hair, and then use the bit comb to brush through.
You won't get them all at once, so I'd recommend doing the same thing, two nights later, and again every other day until they've gone. That way, you bet the cycle, and get the eggs before the hatch. *shudder*
Oh, and don't buy the electronic brush that Boots sell. It's crap and you end up with seriously tangled hair, and an upset child!
See, the trouble is, some parents just don't seem to bother. I check my daughters hair constantly, as she picks them up SO easy.
I do the whole "conditioner" thing, then she goes back to pre-school and catches them again.
They say there's nothing they can do, as they're not allowed to check a child's hair, nor mention it to a childs parents, as it's "discriminating".
Bring back the nit nurse, that's what I say!! :-D