According to the Daily Mail, Land Registry documents show the actress bought the home, which is Grade-II listed, without a lender in November.
James is thought to be dating rock star Michael Shuman, the bassist of Queens of the Stone Age, who has been spotted near to the house in a coffee shop, the Daily Mail reports.
Though the pair have not publicly confirmed they are dating, Shulman, 35, was seen near to where James is currently filming What’s Love Got To Do With It? in Suffolk.
The romantic comedy has been written byJemima Khan and stars Emma Thompson, and Rob Brydon.
The pair were seen outside James’ hotel in February.
The actress, who at the end of last year made headlines after she was spotted with married actor Dominic West - her co-star in upcoming BBC drama The Pursuit Of Love - in Rome, is familiar with north London.
She lived there with Doctor Who and The Crown star Matt Smith, who she dated for five years.
The pair split in 2019.