Detective Inspector Louise Ludwig said: "We would urge all shoppers to be wary of anyone who might be watching you at the checkout.
"Always cover your PIN when you enter it into a cash machine or Chip & PIN machine at the tills.
"Try to avoid being distracted by people asking for directions, and keep your valuables safe."
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The event in West Sussex, formerly known as "Glorious Goodwood" is now under Qatari sponsorship
James Wright has the early morning weather forecast for the west of the Meridian region.
James Wright has the early morning weather for the east of the Meridian region.