Lol, what a pointless and stupid discussion. Bones driving a new car with a new feature and talking at length about it with the product name shown obviously, product placement. Something simply being on screen, not product placement 99.9% of the time.
What should they have done, designed a range of generic non branded cars with different styles so no car brand got advertised, a new company for HP, and cigarettes, clothes, the Royal Family is a brand, maybe they should have gone to "Ruckingham" palace in the first ep of this series. Who cares either way, the vast majority of product placement is not intrusive, when the characters go out of their way to TALK about that product instead of the dialogue being about the story, that is intrusive.
Either way, I didn't like the episode at all, felt more like it was trying to go overboard for a really well known Sherlock story. When shows keep trying new things for the sake of it, they get crap. THe mind palace was beyond embarrassing. Wasn't a patch on the other 4 eps and the polar opposite to the 2x01 in quality all around.