Fifty-fifty on this one. Britain is already a very technologically advanced nation. I found it very hard to swallow a Britain of the future which had somehow reverted in the appearance of its technology (presumably deliberately) to something out of the 1950's. But it was interesting and creepy to look at.
Liz 10 was fun - and her identity instantly apparent the second you heard her name.
The premise fell down too much for me, however. What very black and white options. What absolutes. And evidently no-one in Britain's future is a fundamental PETA member.
I also had problems with the question of what will be used as food in the future, which isn't discussed, nor is any moralising done about the fate of the 'dregs' of society previously. Let alone why they bother to 'drop chute' dumb children if they're not yet useful.
An interesting idea done badly, but prettily.
And for some reason lots of Star Wars allusions.