Your attached file 'Video No Sign C.mpg' doesn't seem to work.
Your photo shows the displays showing the 40mph speed limit as you enter Royal Albert Way. This sign changes to the 'flying motorcycle' sign when the 'No Motor Vehicles' prohibition is active. As I recall this is between 11pm - and 03am.
Looks like there is no time-plate.
However your photo does show they've fixed one issue, there is now a sign on the right side of the carriageway. Previously only the one on the left was present.
On the roads approaching the roundabout there are/were CCTV enforcement warning signs. But the signs did not indicate what was being enforced. There were no warning signs that the Royal Albert Way exit might be closed to traffic. It's these signs that need to be checked. Or at least the ones, if any, on the road you joined the roundabout from. Is that the video that doesn't work?
Here is
GSV for Atlantis Ave just before the roundabout. Now it tells you that there is CCTV enforcement on Royal Albert Way but not when or why. And is GSV up to date? Has the sign changed?
The advance warning signs are important because there is an argument that you are committed to exiting the roundabout at Royal Albert before you can see the flying motorcycle sign. What are you supposed to do? Stop and reverse back onto the roundabout? This has won at Adjudication.