Well, firstly I wouldn't use such language cos I think it's hyperbolic. You could argue that any other govt on earth is either moving towards fascism or Stalinism in that case. It's quite Trumpian way of looking at it. So no, even if I viewed this new law as being such, I wouldn't view any shift to the right as a step to fascism and I don't view the govt taking over Trans Pennine trains as evidence we are on the road to communism either.
That said, to answer the question, I would say that by a country mile the closest we have been was during Covid when the govt successfully kept us indoors, any dissent was not allowed, criticism derided as anti-science, cash was refused in many places and enormous rights were taken away.
So in my lifetime the closest we've been by far was then.