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@benbrangwyn
This isn't straightforward. Difficult to see with all that grease what kind of tool you'd need. Check out this page for the different tools. The first pic on that page is for a cassette, the rest are freewheels. FYI, there is no "lockring".
More on this from Sheldon here.
I'm going to guess that this needs an FR-4.
DoctorBike (winging it a bit here)