Sir Ed is listed on the website of the commissioner, Kathryn Stone as being under investigation for a possible breach of provisions in the MPs’ Code of Conduct relating to the full disclosure of financial interests.
A Lib Dem source suggested that it related to a “minor clerical error”.
A party spokesman said: “Ed referred himself to the commissioner last week after noticing an oversight.
“Ed has been asked by the commissioner not to provide any further comment on her communication with him at this time.”
Earlier this month Sir Ed announced he was resigning his consultancy role with the law firm Herbert Smith Freehills, amid the controversy over MPs’ second jobs and outside interests.
Sir Ed is one of eight MPs currently listed as being under investigation. Others include the Government ministers Therese Coffey and James Cleverly and Labour’s newly appointed shadow Welsh secretary Jo Stevens.
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