Cyclist deaths get a lot more attention that purely automobile deaths, because they are so rare, which makes them seem vastly more common than they are.

In fact, in 2013 there were 14 cyclist deaths in London. 6 of those were in a two-week period in November. That was shocking enough that there was political attention and increased police enforcement around intersections. I'm sure also increased media coverage.

9 of those deaths were from lorries, as you said. I'm sure the majority are also at intersections, as you said, since that's where most cyclists get hit by motor vehicles.

You have a point, however saying that a cyclist dies every week in London 'because they are not wearing helmets' is equally wide off the mark and erroneous.