Thanks for your response, Hiro.
I, perhaps didn't make myself clear on what I need to achieve. I don't have a blown globe problem. I have a problem on the bodywork of my Yaris - a clip, holding the right side of the rear bumper on to the right rear body panel was damaged when my wife had a bump reversing one day. I have managed to purchase a replacement clip, but, in order get access to the broken clip to do the replacement, I have to be able to remove the whole R/H plastic rear light assembly, which I don't know how to do.
I think that, to access the screws/clips holding the rear light assembly, I will need to remove the hard plastic boot lining - this is quite a big job, and, I was therefore hoping that someone might know of an easier way to proceed.
So, unless someone in the Club comes up with another solution, I will have to proceed to remove the boot lining.