Dodgy Russian money has destabilised Britain's democracy. We have to crack down on it | Gina Miller

Conservatives have taken cash without asking tough questions. Even now they have no credible plan to clean up Londongrad'

In 2010 I was approached on behalf of a Russian multimillionaire offering 30m. I'd recently launched a philanthropic foundation to help grassroots charities cope with the aftermath of the financial crisis.

We attracted a lot of support from individuals with genuine motives, but soon we were being approached by professional philanthropy advisers - a recently established money-making trade created by wealth managers and private offices". But on this occasion an adviser from a luxury concierge firm told us it had a Russian client willing to give us a huge sum to help us start up.

Gina Miller is a transparency campaigner and leader of the True and Fair party