The National Portrait Gallery has insisted its £35.5m redevelopment designed by Jamie Fobert Architects and Purcell will not be hit by a high-profile donor pulling out.

The project, the biggest in the institution’s history, made national headlines after the Sackler Trust pulled £1m of funding.

It came amid a row about the source of the donation. Campaigners argue the money is tainted because much of the Sackler family money reportedly comes from the highly addictive opioid painkiller OxyContin. The drug, which is made by US pharmaceutical company Purdue Pharma, is the subject of lawsuits over its safety. Millions of people in the US are said to be addicted to opioids.

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