I'd not heard of Kendel Green until the OP but am familiar with Lincoln Green and have dye with both Weld and Woad.

I agree entiely with the comments about Scott's historical accuracy - take a large pinch of salt.

Ditto those about the historical use of a Kendel Green in a kilt.

Although the colour is often mentioned in connection with Robin Hood in truth there would/could never have been one specific shade because of the vagaries of working with indigo (woad) and the fact that the yellow will fade over time. In reality there would probably have been as much variation in Kendel/Lincoln Green as there is in Buddist Monks' Saffron Robes.

Weld was also used in Highland dyeing where it was known as Lus na con - Dog flower.