Thanks everyone for this. I'm slowly changing all my bulbs to LED's and this charge port light was annoying me!
Just to help anyone else considering this, my light was really stiff and wouldn't budge but if you look at the 'claw' side of the clear lens you'll see a small rectangular recess - just big enough for a medium sized flat bladed screwdriver....
I put a screwdriver in and, holding the end of the blade close to the light, I pushed it and the light fitting moved just enough for me to pull the blade down and free the light fitting.
Then, as it's been said, it only takes a minute or so to unclip the light connection and untwist the light housing, where I swapped out the light bulb for an LED one.
I'd have posted a photo, but to be fair, it looks like the photo above!
2015 GX4h in Black
Living in Scotland