The indicator is still present and correct where it was clipped.
However, I was concerned my back end had been becoming increasingly mobile. On closer inspection both rear dampers had been sick down themselves.
Thankfully a nice man had some virtually brand new Munroe dampers and showed up with them last weekend.
Out with the old:

Which included this highlight of a spring cap


Which has obviously rotted out and then cracked open.
Back end is now much tighter and is sitting a bit higher. Might change back to the old springs, which appear to be rather more tired than those now fitted, which isn't a bad thing with new dampers under them.