Further to John’s email this morning, here is a link to an article detailing the models affected and how to find your product and manufacturing code numbers.
https://www.cyclingnews.com/features/shimano-global-crankset-recall/

The article goes on to say this…
“Despite their similar appearance, Shimano’s 105 chainsets are not affected by the recall, due to a cold-forged manufacturing process. Likewise, no 10-speed or 12-speed components are affected either.”