The Data Protection Act relates to personal data and sensitive personal data, that identifies or is likely to identify an individual. While that might include things like date of birth or your housing records or your name and address, it also includes CCTV footage.
Where is the line between filming in public and CCTV?
Presumably someone's personal name that for business purposes is publically displayed on the side of a white van cannot be classed as personal information because it has been made public by the owner.