Sam White of Pukka Insurance has also been speaking to Radio 5 Live's Wake Up to Money about Brexit and the Queen's Speech.
As a car insurer, she said the biggest challenge was around car parts, which are imported from Europe.
"We’re looking at different ways to solve the problem... because of the lack of clarity, trying to build a business plan on the back of the information that’s coming out at the moment it’s virtually impossible".
And, she said, at a recent dinner with European insurers they "were completely gobsmacked by whole process. it's far to say they are really worried. I think the lack of clarity is causing a great deal of concern".