Cyclist vs Van. Who is wrong in this scenario?
The cyclist is clearly in the wrong. 

A turning vehicle must indicate some distance or time (depending on the jurisdiction) before changing lanes or making a turn. There are no exceptions for bicycles, or keeping hands on the bars.

I think the driver has done well to avoid the danger created by the cyclist. 

See also Best ways to avoid getting hit by cars?

And How to get over anger at inconsiderate drivers