Data Protection Act 1998
This relates to personal information (even names) for living persons, there are exemptions e.g. lists of names in telephone directories are exempt but sensitive stuff isnt, especially
1/ racial ethnic orifin
2/ political opinion
3/ religious belief
4/ trade union membership
5/ physical mental health
6/ sexual life
7/ offences
8/ court data
If the persons identity is not presented then no breach has occurred.