Unless you already have a vast amount of money to cover for any loss.
For example, imagine Bill Gates decides to open a property investment fund in UK, backed up by his own personal funds.
Lets say he deposits 2Billion pounds in his account at some British bank and just let it sit there gaining a little interest, only as a back up in case his fund needs the extra cash.
At that point, he could receive up to 2billion in investments that would be 100% covered... and that would be his line. "Bill gates always pays his debts"
that's a responsible way to do it in my opinion. So no matter the contingency, brexits, etc, your fund would be always able to pay every single cent to every single investor at any given time.
Plus, that's the only way to make sure the investment fund gonna work his socks off to always do the best they can... when its their own money on the line too.