The UK's Electoral Commission says it has still not decided whether or not to take action against Nigel Farage over his failure to declare free use of an office.
Ukip have insisted Mr Farage made a declaration about the use - which constitutes a donation under electoral rules - to the EU authorities in Brussels after being advised to do so.
"We have not yet made a decision about whether any further action will be taken against Mr Farage for reporting the donations late," a spokesman said.
"We are continuing to review all of the necessary information supplied to us by Mr Farage and are considering it carefully."
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The bus reportedly hit a tree near Russell Square.
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