Karl Dasher, Schroders’s North America chief, knows he is shooting at a moving target in his battle to double the percentage of the firm’s revenue that comes from the US.

The mission sounds straightforward: increase the percentage of revenue that comes from America to 20% over the next three to five years. But, as Dasher puts it, he has to increase the US business's share of the pie as the rest of the firm continues to grow.