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Can anyone help with 56 across? I have no idea but the clue is "Abbreviation for the factors that highlight products or companies from their competitors (1,1,1,1)" I have ?s?s. Help please!

USPS

https://en.m.wikipedia.org/wiki/Unique_selling_proposition

I've heard it referred to USP'S (Unique Selling Points),

Thank you Cerasus and Brendan, this was out of my experience, your help is very much appreciated!

It was new to me also - until it became one of the most hackneyed phrases on 'Dragon's Den'!