Not sure whether there was a thread for general information on T5, but as I couldn't find one I have created this one.

M&S landside in T5 is closed, and it looks like it will be for a few days/weeks more. It was closed on Thursday with the shutters across and the same signs about being back soon. Today it now has hoardings around it. I know some like to pass by after arrival to pick something up, so for now you may need to think of a plan B. The M&S website seems to think the store is still open.