www.nugaming.comI have had very good experience with
www.nugaming.com (and personally I know others who have too). They only give 10% off, but do give free shipping, have no minimum order size, are Uk based (with a real postal address), packaging is excellent, they have been around since 2002 and read the terms and conditions- very reassuring. I don't have any connection with the site apart from being a satisfied customer. I cannot see myself shopping anywhere else for new stuff.
In addition to GW stuff, they carry a very full range of other wargaming stuff too.
Note, 10% off and free shipping is often cheaper than 20% off....
If you are feeling nice and go on to order from them, if you quote my email address I get a referral bonus from your first order. Ask and I will give you my email address.
mods, if this is not allowed, I am sorry, just delete this last sentance