Unigestion, the Swiss boutique fund manager, has challenged the buyside consensus by stating that a Brexit would “be more detrimental for the European Union and the eurozone than for the UK”, and that a withdrawal would make “little difference” to the UK’s long-term economic interest.

The €16.3 billion manager, headquartered in Switzerland, which sits outside the European Union, said in a research note that in the event of a British exit, the significant common commercial interests between the UK and the EU would force both parties to strike a rapid trade agreement.