Quiver plots using Plots.jl

Dear all,

Would anyone have an example of a quiver plot where the size of the arrowhead and length of the bar can be controlled?
There are old threads about this issue and I did not want resurface them as this issue may be addressed by now.

My aim is to use Plots.jl with the standard GR backend.
I am aware that other packages exist, but I want to stick to a single visualisation tool in the context of teaching.

Cheers!