"We are the most successful platform you have never heard of,” said Amir Hakim, proposition director at Third Financial.

With around 80 members of staff, Mr Hakim said Third Financial would be sixth in a platform league table in terms of assets under management (AUM).

Indeed, Third Financial has over £50 billion in assets on its platform.

The firm is supported by private equity backers. However, chief executive Ian Partington was keen to stress the back...