Thanks for all the advice.

I'm using a nit comb atm and managed to get loads out of Liebling's hair last night and some from mine - although I lost so much hair to the comb you couldn't really tell much more. We all used a pregnancy-safe treatment too, so although I'm not going to fully count us clear yet, both the treatment and the comb say they get the eggs as well as the lice. So going to keep up with the conditioner-and-combing for us all for another week. I'll wash with vinegar too next time I wash my hair first, can't hurt any.