Sollisk posted this last year.
Hi So had a look and worked it out.
For anybody else who has to take off rear bumper.
2 visible screws each side of the boot opening, Star
type things each side , in the wheel arches, the type you push the pin
into the middle when in place and it splays out the ends.
just above where one of these plastic rivet things there is a bolt that holds the bumper to the car.
Underneath there are 2 more rivet things holding the bumper to an underside frame.
best to take the 2 rear light pods off, pull back
and there is one screw on a stick coming out of the pod
. undo this and the pod comes out.
then pull around the bits still connected and it will pop off. careful around the light pods as it seems to get stuck here.
This worked for me 1.4 model.