Or, Ms May may not and must not; at least, not yet.
(For readers outside of the (ice) hockey world, substitute “end of first half”.)
The UK QB ruled unanimously (3-0) this fine English morning that the Tory gov’t cannot use the Crown’s prerogative to initiate the UK’s withdrawal from the EU. The decision to withdraw or not – the decision whether to give notice under the applicable EU treaty – is for Parliament to make, not the party in power in Parliament; aka the “gov’t” or the Crown.
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 for the reasons we have set out, we hold the