There's the three 10mm ones underneath, a 10mm one each end going sideways into the bumper. Up near the nearside foglight there's a big(17mm?) bolthead. There is a large plastic spigot in the same relative place on the offside (you can't see it).
With all those bolts off the bumper just pulls off the spigot: it needs a bit of a tug, though
There is a multipin connector behind the nearside wing guard
It needs some rags/blankets or whatever on the ground if you are working alone because the bumper comes loose with a bit of a rush.
I think I knocked a float off the low washer sensor or something because the low level light comes on whenever I use the washers!