Toilet/loo just varying hte vocab. It was the grammar that was being aked about.
I thought saying 'already' was a colloquialism, i did n't realise that it is considered 'correct'

And about the Toilet/bathroom thing in Harry Potter. I think the bathrooms at the school are seperate to the loos. ie the bathrooms are just that. they may hav one or two loos in them, as opposed to the toilets which contains just loos (and sinks).