Went to my local M&S food store today (Fforestfach, Swansea) and picked up the roast potato coating (as seen on the ad). When it was scanned through (should have been 99p) it came up with a 99p discount! When the cashier queried it the supervisor said that they should have been taken off the shelves yesterday. She then told the cashier to let it go through! I'm sorry I didn't get the receipt. Apologies if it is store specific or no longer valid.
M&S new ' terribly clever ' roast potato seasoning / coating as seen on the ad - FREE