For Mr Bates, improvisation exists to subvert expectation, a view that stimulates or irritates according to your frame of mind.

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This expectation is driven by our view that slowing demand will ease resource and capacity constraints.

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Changing the immigration rules won't directly alter that judgement in law, but Mrs May told the BBC today that she had "every expectation" that "judges will respond" to what she described as "Parliament's view".

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