1 in 3 UK Workers Are Using AI at Work Without Their Employer Knowing

A new Deloitte survey of 25,000 working adults across 22 UK industries reveals that shadow AI has quietly become the norm in British workplaces. One in three employees who use generative AI for work are doing so without employer knowledge, creating blind spots that directly affect how organizations measure AI adoption, ROI, and risk.

Key Takeaways

• Shadow AI is widespread: 63% of UK workers surveyed have used generative AI; half of those received no training from their employer on how to use it.
• Productivity gains are uneven: 30% of all respondents say generative AI saves them time each week, but 31% report no time savings at all. Only 7% save five or more hours per week. Results vary sharply by industry: 21% in information and communications save five-plus hours weekly, versus just 5% in healthcare.
• Leadership credibility gap: Only 35% of generative AI users say their leaders speak about the technology with a good understanding of it — a factor likely keeping hidden users from disclosing their activity.

The finding matters for finance and operations leaders trying to make the investment case for AI. Approved licenses and usage rates may significantly undercount actual adoption. Employees may prefer a public tool they already know over the corporate-approved option, skewing the data used to make resource decisions.

Deloitte's findings also expose a risk layer: employers do not know which tools employees are using, what company information is being entered into those tools, or where the output ends up. As AI governance frameworks mature, that visibility gap becomes a liability.

The report stops short of prescribing a fix, but the signal is clear: finding out which tools employees already use — and why they chose them — is a more useful first step than another top-down adoption target.

Read the full article on CFO.com.