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It's thought to have cost more than £250,000, but nobody knows who's behind it.
Researchers say there is little optimism about the outcome of negotiations.
Also faces claims she's trying to 'rig' the final Commons Brexit vote
Labour says PM "in office not in power".
Initial testing was due to begin in January 2019.
Here's how to use social network's new tool to check up on the issues you care about.
It's the first time an automaton has been quizzed by MPs.
The figures are more than double those of 2012/13.
Maria Miller says legitimacy of the Commons is being 'undermined'.
The Chancellor must find the equivalent of a penny on income tax, National Insurance and VAT.