I found them wriggling after she pooed in her potty this evening. Gross. Think she picked them up at pre school as one of the staff had them a few weeks ago (presumably caught from a child).
Weirdly, she hasn't been itching or uncomfortable and I don't think they've been there long as she tends to poo in the potty so I can see what's, er, coming out.
Anyway, did a mad dash to pharmacy and got family pack of Ovex, then came home and cleaned for an hour and a half and stuck all bedding/towels in wash, changed PJs etc...
Will re-dose with Ovex in a fortnight (even though it doesn't say that you have to) and hope that this is the end of it.
6yo DD1 is totally freaked out by the idea of it. Won't go near DD2 and is washing her hands like a maniac!