I too am excited about the 12 days of treats in December now I know about it.
I've had a few freebies
a pack each of bananas, apples and pears,
porridge pot
loaf of bread
chocolate bar
couple of bags of percy pigs
That's what I can remember, there could be more.
Plus a good few money off vouchers and free extra sides on the meal deals.
I'd say I spend £1-2k a year in M&S usually in small food shops and some clothes. I pay for it all on my M&S credit card so I don't know if that makes a difference?