Then there's nothing for you to do procedurally until you do.
However, as we don't know how Europcar's notice was sent it would be useful if you would confirm that their records have your current address for service(which is where your PCN would be sent). Also, what's the date of their notice - to give us an idea how long you should play a passive role and when to start asking 'where's my notice'? You could also look at Newham's website for the video and confirm where and the circumstances.
GSV shows conflicting signs with a regulatory(not advisory/warning) part-time 'no right turn' sign for all motor vehicles which then feeds into a part-time but conditional pedestrian zone. This might suggest problems with their traffic order which it might be worthwhile obtaining while you're waiting.
