Large chain store. Got into queue (queue area is well defined, has dividers etc, products in the run up to till...alright it was Boots. You quite clearly can't miss the queueing area in Boots).
One till open, a couple at till being served. Am next in line, some woman wanders up on the exit side of till and hovers. Looks at me and woman behind me. Continues to hover. Then says to till assistant "am in queueing in the wrong place?". He confirms she is.
She STAYS THERE, then tries to push in front of me when it's my turn to be served. Then starts arguing about how actually she was there before me (she wasn't) and was in front of me, etc (no, because you weren't in the queue). Till assistant looks terrified.
WIBU to insist on being served and tell her that once she realised she was not in the queue, the correct action would be to get in it, not expect to be served ahead of those of us queueing?
Probably not relevant to etiquette of scenario but I have recently had surgery and am still pretty unwell, get dizzy and light headed if on my feet too long and just wanted to pay for my stuff and get back to the car before I had to sit on the floor like I did in Halfords the other day. This may have made me more strident than usual.