re Celeste and Stephen
We weren't shown get how but once Bethany decided (because of her aunt's health and continued activism) to use her technology access they seemed to form a group of primarily women to plot to get Viktor out ( and for Edith an uprising).
Part of the plot was to get Celeste inside the company where Stephen work to get access to the codes through their Government contracts. (Stephen later realised she had only been friendly to get him to get her a job.) On her own I think she then thought she could delete his part in the company more to protect the children than him.
On other points mentioned earlier re Stephen being in Spain etc.. We dont know in this future whether the EU survived. It seemed different countries were each operating their own anti refugee policies.
Not sure but did wonder if the BBC didn't want anything too overtly about currrent politics but allowed the series to explore the possible future of different trends eg the rapid increase of technology in our lives, refuges (no sense that the UN or whatever had tackled the crisis of war and econmic poverty in developing countries to slow down the rate of refugees).
I think Muriel's speech was about what happens if you just dont pay attention or allow what is offered to us as being what we want. ie if we dont take responsibility for the future those who are motivated to have control will find it easier to do.
So the man in the bow tie doing party tricks on tv as a future politician was saying you cant ever stop being aware of what is happening.
The problem is when we have a media that report politics as celebrity games show its hard to pay attention or to care.
I dont think the population would have rushed out to support a revolution that started by liberating refugees from camps. I suspect most would shrug their shoulders and want their favourite tv programme back on screen. Or say camps are the best place for them. 