Should it be illegal to publicise someone else’s products?
"Supposing someone decides - openly and honestly - to publicise your
products. They point people at your products and they are a reputable
outfit themselves. What are the circumstances in which you send them a
threatening legal letter demanding the cease, er..., providing you
with free advertising for your products?"
http://www.markpack.org.uk/should-it-be-illegal-to-publicise-someone-elses-products/