The problem that any ardent Blairite must confront is that there are no ideological grounds for taking on Mr Brown: the policy differences that divide him from Mr Blair, although real, are too nuanced and subtle to provide any.

ECONOMIST: Bagehot

It is such whiffs of Welsh triumphalism that English-only speakers object to the not-very-subtle implication that the only real Welsh are those who speak the language.

ECONOMIST: The Welsh language

This may be a subtle distinction, but it is a real one.

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So what are the subtle signals that can indicate which candidate is more in command, more present, and more real?

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And with its growth, companies will find ways, subtle or otherwise, of getting their share of what is currently the most valuable yet untapped real estate on a computer screen.

BBC: Messaging in an instant