lol yeah i find that sometime they will do that  sometimes  i by mine in bulk  if I'm going to ireland  i will order them and pick up from the store in belfast
i love m&s ones i have been using them for  years  never used anything different i had  a heart attack when i couldn't  get any in my local stores for a while but then i realise i could just order them on line

I used to buy M & S stockings in bulk, but I bought three new pairs last week and they've all laddered already just from wearing during incalls. What the heck?