I deleted the radio antenna when I sorted the trunk battery rust issue and got onto removing the radio today.
Thought I'd check the shift boots while things were stripped, and not altogether surprisingly, I found the Upper Shift Boot torn.
Whipped it off to check the lower shift boot, and found it torn too.
Resulting in...
None of the internal bits appear broken apart from one of the Tabbed Wave Washers, but I'll replace everything I can while it's open. Fun at the local dealership sorting out parts tomorrow.