We were in M&S queueing around that time {Christmas} and a solid woman aged about 50 actually hit a slim young mother who had a child with her in the food queues {The aisles were all manned back then}.
The large woman was repeatedly punching the young woman, who turned and gave the older woman a warning.
The larger woman hit the younger one a third time..
Slim raised her hand and delivered a clap to the cheek of the large woman who actually roared- vast open mouth- while her eyes span in different directions
Slim ushered her child out while Large began to swing a bags of shopping around her head like Bolas and let it go, hitting slim on the way out.
Maybe slim had taken the last Christmas trifle, who knows!
We thought there would be a full on smackdown in the aisles.
Maybe M&S laid it on as 'entertainment'
Security guards looked on and did nothing.
So unlike what one would expect in M&S.
From what you say, this sort of thing wasn't unusual back then?