They very begrudgingly let me use the Bus class toilets when my baby was screaming his head off because he had a soiled nappy and it was clear I would have to wait some considerable time to use the economy ones.

on a separate note,  I have just travelled back on QA and could not fathom whose bright idea it was to put all the people travelling with babies at the front next to bathrooms with no baby changing facilities in any of them!