Labour has renewed pressure on the Government over the leaked Panama Papers by publishing an expanded set of demands for tackling tax avoidance.

John McDonnell has repeated his call for a public inquiry over the revelations of a super-elite taking ultra-complex measures to cut their tax bill.

The shadow Chancellor has published a ten-point plan, embracing increased powers for HMRC and EU-wide deal for multinational firms to adopt country-by-country tax reporting, as he tried to pin the blame for the scandal more closely on David Cameron and George Osborne.

McDonnell described the furore as a leadership issue for Cameron, who has been battered by the disclosure that he benefited from an offshore fund set up by his late father, and Osborne, who has been dogged by the emergence of a BBC clip from 2003 in which he recommended the use of “clever financial products” for families to cut their inheritance tax liabilities.

“This is a test of leadership”, McDonnell said in an opposition day debate in the House of Commons.

“The leadership of the [Tory] party opposite could take this opportunity to correct the series of errors it has made.”

McDonnell published a tax transparency enforcement programme in which he demanded: