Brexit breather but referendum has shock potential, says CMC's Jasper Lawler

There's been a brief respite on European markets overnight but in the background serious concerns about a possible British exit from the European Union loom large.

Just this morning, the US Federal Reserve left interest rates on hold as expected but cited uncertainty over a possible "Brexit" next week as a key factor.

That's ramped up worries about ramifications for the global economy - including Australia.

Jasper Lawler is an analyst with CMC Markets and I spoke from London earlier today.