So for the benefit of the forum and at great expense to myself, I have purchased the front and rear hub nuts for the Grenadier. So that amongst us we can try and find cheaper pattern parts or parts from other manufacturers that may be cheaper. Also so that someone can identify a specific tool to fit the rear hub nut . The rear hub/ring nut was £82.95 + vat and the front hub nut was £85.17 + vat. So bloody pricey. Both nuts are a 1.5mm thread. The rest you can decipher from the photos.