I used to teach a basic introduction to Data Protection law as part of the various IT courses I’ve been a tutor on over the years. Unless things have been changed to protect businesses and other organisations, the DPA only ever applied to clearly identified individuals.
Providing a list of businesses where Welsh is spoken shouldn’t require the consent of the owners. However, saying that Sally Jones, aged 24, waitress at Caffi’r Tebot Bach is a Welsh speaker happy to converse with learners would.
But I’m saying that after a quick skim of the guidelines relating to the new act which gave me the impression that it still only relates to individuals, but obviously advice from someone who is au fait with the new laws coming in is advisable.