......to expect M&S sheets to last more than 6 months?

Good news !

Happy ending to the story-took sheet back last week and was given an immediate replacement. No hassle at all-well done Markies!

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I bought some bed linen from Debenhams in their sale - 800 thread count so I am hoping it lasts for years. It feels lovely and smooth.

We have some M&S sheets and pillow cases which date from the late 1970s, still in regular use.
As I've said before, modern fabrics, whether for dressmaking, clothes or bed linen etc, are of very inferior quality. Not sure why.

M&S used to sell quality bed linen but if you have bought in the last year or so you will find they have deteriorated. I bought a sheet that pilled first time on the bed and went tissue thin when washed, it was binned. Quality of clothing has gone downhill too, we no longer shop there even for food.

Take them back Katek. It may be they have had a problem with a batch. But M&S will exchange them without a quibble if you're not happy.

We have M&S duvet cover and sheets on the bed at the moment which must be 15 years old at least and have been used every other week since I bought them.
Sad to say there is a tiny tear in the duvet cover which I keep meaning to mend and one of the pillow cases has worn thin but they have given us very good service.
They are a high thread count and still feel lovely.

I'll definitely be taking them back next time I'm in town. No receipt but good idea re bank statement grannyben

I think i would email them saying you expected more than 6 months wear. If you don't have the receipt is the payment shown on your bank statement

My M&S sheets are a couple of years old and still look like new.

Yes definitely take them back, my M&S sheets are years old as well. Maybe it was a faulty batch.

Gosh! Our M&S sheets are decades old and good as new (a bit softer though after so many years of being washed!).
Take yours back to the shop Katek. Let us know how you get on.

Take them back with the receipt if possible.