Two questions for the U.K.

 The OMT for Doctor Who is "watching from behind the couch".   In every American house I remember, the couch/sofa/davenport is firmly against the wall.  A child who wanted to watch from there would first have to push it forward several inches.   Are British houses differently arranged, or is this just an image?

We were watching QI last night, and the panel were marvelling about American drivers' custom of stopping* when they heard a siren.  (My family: "We don't stop!  We pull over and stop!")   What do Britons do when they hear a siren?  As my daughter exclaimed in outrage, "What is a siren FOR, then?"

* Some of them**.  If they don't have anywhere important to get to.
** When I first moved to the New South, drivers always pulled over -- in both directions -- when a funeral went by.   Ambulances were much more hit and miss.   

...golly

 18-foot sea serpent* found off Santa Catalina island.

* all right, all right, oarfish.