I’m using the link from ArcMap to Add data – basemap – imagery.
The confusion I have is that for the aerial imagery I had for a location was 2016 a few weeks ago but is now 2011.
This might be why you're seeing older imagery: Issues with the World Imagery Service — Esri UK although I assume you're the same person who commented on that post
Does the World Imagery Clarity service meet your needs better? http://www.arcgis.com/home/item.html?id=da10cf4ba254469caf8016cd66369157
You mave have used this before: How To: Provide feedback on basemaps in ArcGIS.com but could be useful tool to be specific about the areas you're looking at. I'll also recommend contacting your region's Tech Support team directly as well. If you're in the UK you can do this using one of the methods listed here: Contact Support | Esri UK