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Halfords do 'Camouflage Khaki' Which isnt quite the same as Bleached Bone (Ushabti bone now).

It looks like this;

The Terminator pad in the photo is sprayed with Halfords Camouflage Khaki, while the pads near it are the citadel colours just behind them.

Here is the spray in question; only 300ml cans though :( There is 4 colours in similar cans; black, brown, green and kahki - intended to be used all together to make British Army camouflage.
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_800811_langId_-1_categoryId_165495

Hope thats helpful; its not exactly the colour your asking for but its close-ish and quite available. I like it as a primer colour especially on my Orks (I know its not strictly primer hehe, but neither is the halfords matt black spray that is so popular and it does just fine)

I dunno if its my monitor... but the green looking one is the citadel kreig khaki colour.

Left to right they go; kreig khaki, ushabti bone, halfords camouflage khaki, screaming skull.

I found it to sit nicely in the middle of ushabti bone and screaming skull Its very flat though (being 'ultra matt finish') and looks a bit neutral compared to the citadel layers.