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Aren't the Vallejo Game Colour paints a copy of the GW range?
They are, and are closer to the previous range or two, rather than the current ones. The names are pretty similiar too.
P3 Formula range of acrylic paints has an exceedingly good selection of different browns, complete with three different brown washes. Can recommend them all. To my knowledge they're made by the same English company that made the old Citadel paints and makes the Coat d'Arms paints, too. Sold in Europe by Firestorm Games, Battlefield Berlin, Alphaspel, Wayland Games and likes.
yesso are coat d'arms
Having the paints already is a bonus! I find the game colour range thinner than Vallejo model range but you are certainly correct regarding the high pigment quality.
Try thesehttps://shop.instarpaint.com/vintage-conversion/