I noticed one of our 4 year old M & S base sheets had a big threadbare patch this morning. We change the bed about fortnightly and rotate the sheets around so that each one won't go on again for a couple of months so its not as if it has got a lot of wear and it is a more top of M nS range sheet! What would you do, do you think its worth complaining to m n s or just put it down to experience