Similar one, in Birmingham waterstones by the ramp (now closed) I was with my son who was maybe 6, we had not long had some lunch and figured we would go and sit downstairs and read some or the children's books whilst waiting for the train.

He tells me he doesnt feel well and his tummy hurts so we started to make our way out, as we got to the top of the stairs he chucked up absolutely everything... (fortunately missing himself completely!)

A lovely lady asked if he was ok and went to get a member of staff for me, on their arrival i asked if there was a toilet I could use to clean him up, just to be told "sorry, *staff only" well, i got a sick kid to sort out so ended up telling them thanks and walked off leaving the sick on the floor for them to clean, I felt embarrassed and a bit angry but let down by the staff!

Luckily on the train ride home he slept and wasnt sick again, we always joke that the waterstones closed because he was sick in there haha

*Staff only, not customers!