Is capital fleeing the country as foreign investors anticipate a period of uncertainty after the election?
Crossborder Capital, which monitors current account balances, foreign exchange trades and other money movements said it picked up a $24bn outflow in March.
The firm's chief executive, Mike Howell, says he "has a hunch money is leaving".
On the other hand, there has been a regular outflow over the last 12 months. The drain is partly the result of Russians taking out funds to make sure they aren't affected by sanctions, so it's a big leap to assume any connection with the vote on Thursday.
What is more, Bank of England figures show a completely opposite flow of money in March.
Foreigners spent £28bn buying UK government bonds or gilts in March, after two months of net sales.
The European Central Bank has been busily buying the bonds of Eurozone governments -- part of its QE programme designed to boost economic growth -- and that's made UK investments more attractive.
The Bank of England's stats also show that deposits by non-residents in UK banks increased between February and March.
I am told by people who advise foreign investors in London that they are, nervously, sitting on their hands, waiting see what the election a a June mini-Budget might bring.