Usually they do, as they need a written statement and you get to draw a sketch of the junction and positions of your cars
I had to do it when an old man turned right across a junction when I was going straight on through a green light (because "he made that turn every day without someone else being there before"). He admitted liability to the insurers but his daughter (who wasn't there) wouldn't let him settle the claim without receiving some money himself (claiming suddenly that I was speeding and wanted an 80/20 split)

EDIT: It's also worth taking some photos of the site, especially from your point of view as a driver so that the insurers can see that you had limited visibility.
( h3donist tryin' to play me out as if my name is Sega.., Wed 22 Jun 2011, 11:14, archived)

i have photos, my insurance people took my statement over the phone and they do not want a form or anything.

( sleepybinky, Wed 22 Jun 2011, 11:47, archived)