That's where I ordered it from. But .com not .co.uk. But it's coming from abroad.
I assume it's not the famous LW one that got removed recently, but the other one that offers shipping abroad? Which country is it actually shipping from? This last factor (the country) can make a difference if comes to customs, that's why I'm asking.
If you get it, also make sure to keep us updated about what's on the customs declaration. But try not to worry too much, there's nothing you can do now, except waiting. Even in worst case (another police visit), they can't really do anything if you don't let them in or allow them to search your home.
EDIT:
Just read it ships from Russia. I didn't even know there was a source on that website that ships from Russia. In any case, they'll most probably use a fake customs declaration. I have ordered lots of things with false declaration and it never got seized by customs, but ofcourse I live in the EU, not in the UK.