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But you can't revoke with the intention of reinvoking simply to effect a scheduling change.
They can revoke for whatever reason they want. The point is that, having done that, they can't re-invoke A50 without good reason*.
(* If they do revoke A50 then the EU would probably only allow it to be invoked again if the UK can clearly demonstrate that it was still wanted, i.e. general election specifically based on this issue and/or another referendum with clearer definitions of what people are voting for, and that the UK had an idea of what type of Brexit they wanted prior to attempting to invoke it.
If the UK isn't allowed to reinvoke A50 ever then we're permanently stuck in the EU. So it becomes a question of when, and why, we'd reach a time when the EU would accept A50 revocation again.)
Personally I'm still clinging on to the hope that April 12th will loom with nothing going through and the Govt will be forced to revoke A50 to avoid no deal. That would probably trigger a GE and then either:-
a) It's left to party manifestos (in which case we'll be fucked again as I doubt Labour will change their position from 'respect the result of the referendum')
b) A second referendum and hopefully it's told to go awayNeither will resolve the underlying disquiet in the population.
But you can't revoke with the intention of reinvoking simply to effect a scheduling change.