I think because it's known SCDave is a mod here that his boss (also a member) can explain Canterbury's concerns directly.
As much as I'd love to see complete mock ups of ideas for a new strip, we've been told we can't, or at the very least, been asked not to use Canterbury's logo on non Canterbury products.
Being the nice folk that we are, we thought we'd spare SCDave some grief at his work and comply with their request before it went any further. This issue isn't up for debate, so please don't look for one.
If and when any other copyright holders contact the site and ask us not to display their logo on bogus products or mock ups then we'll do the right thing and comply with their request, until then batter in.
We know you'll dig the vibe.