The company made the admission to the information Commissioner's Office (ICO) which is investigating the incident, which affected 58 million users and drivers and was kept secret until last week.
Uber failed to disclose the massive breach at the time, the company's new chief executive officer said last week.
The group of European data protection authorities said today they set up a task force to probe ride-sharing company Uber. If UK citizens were affected then we should have been notified so that we could assess and verify the impact on people whose data was exposed.
The Land Transportation Franchising and Regulatory Board (LTFRB) will conduct its investigation on the data breach involving personal data of users of ridesharing firm Uber in the Philippines.
A spokesman for Uber told the BBC the firm is not able to clarify how many United Kingdom drivers are included in the 2.7 million.
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Filipino data subjects were affected, but there was no indication that any driver's license was downloaded, it said. "There is no excuse for keeping this information from consumers". The incident took place previous year but was only revealed last week.
A statement of claim filed this week in Calgary by Branch MacMaster LLP said that Uber's handling of the whole affair was "willful, reckless, wanton, negligent, callous and in total disregard for the security and rights of the plaintiff and class members". Under such a theory, he argues that Uber should face a penalty of several millions of dollars.
The letter also notes that Uber entered into a consent order with the Federal Trade Commission (FTC) in August 2017 in response to the company's privacy and data security standards.
Ferguson said that based on Uber's characterisation of the information hackers stole about Washington passengers, he does not believe Uber had a legal obligation to notify them. "We are committed to changing the way we do business, putting integrity at the core of every decision we make, and working hard to re-gain the trust of consumers".
That revelation prompted a delay in a high-profile trial over whether Uber stole self-driving auto technology from Waymo, a Google spinoff.