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The mystery of who edited Wikipedia to include comparisons of rising Labour star Chuka Umunna with President Obama took a new twist today.

For the Evening Standard can reveal that the person who added a flattering reference to the “UK’s Barack Obama” to Mr Umunna’s Wikipedia profile used a computer at the very law firm where he was working.

The disclosure is embarrassing for the Shadow Business Secretary who has modestly dismissed such comparisons in the past as “lazy” and annoying.

And when asked if Mr Umunna made the change himself while at the firm, his office did not exactly issue a forthright denial.

A spokesman said: “This change was made over half a decade ago. Chuka has no record or recollection of having a log in for Wikipedia or having edited it.

“Though staff have had to make corrections for racist vandalism of the page in the past.”

The Wikipedia profile was set up in 2007 and has been altered many times over the years, in keeping with the site’s policy of allowing users to contribute.

In a 2011 newspaper interview the Streatham MP said of the Obama comparison: “It annoys me a bit. You get lazy journalists and the odd blogger who’ll suggest that I fancy myself as ‘Britain’s Obama’ and that I seek to encourage the comparison. It’s never been something I’ve encouraged.”

However, web records show that in January 2008 a computer registered to Rochman Landau, Mr Umunna’s employer from 2006 onwards, added an article to his profile which said he “may end up as the UK’s Barack Obama”.

Wikipedia’s rules say users should not edit the site to promote their own interests or those of employers.

Tory MP Keith Simpson said today: “I don’t know if he has made the change. However, the trouble with changing one’s own profile page on Wikipedia is that it’s rather like an internet face-lift; you can always see the stretch marks.”

Earlier this week it was reported Mr Umunna may have created his own profile on Wikipedia under a pseudonym, “Socialdemocrat”.

Mr Umunna said he had no recollection of the log in, but could not guarantee someone campaigning for him was not responsible.

The politician, a one-time DJ, also sparked controversy recently after it emerged he had branded West End nightspots “full of trash and C-list wannabes” on an exclusive website for so-called “jetrosexuals”.