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Thanks for the link! I think their combination stone is a lower end one: http://www.axminster.co.uk/recno/4/product-King-Japanese-Combination-Waterstones-22468.htm. It is described as a beginners'...

Where do you buy them in the UK?

It is the same manufacturer but I am not sure what grit this one is.
The cheapest King stones I found until now are from Japan Woodworker. I have asked them about shipping costs.

180 dollar is...

Has anyone had any experience with a King 1K/6K combination hone?

This one is used a lot by members of nassrasur.com instead of the Norton 4K/8K.

It is less than half the price of a Norton!