If you want to complain about how researchers have handled your information, you should contact the study team. If you are not happy after that, you can contact the Data Protection Officer. The study team can give you details of the right Data Protection Officer.
If you are not happy with their response or believe they are processing your data in a way that is not right or lawful, you can complain to the Information Commissioner’s Office (ICO) (www.ico.org.uk or 0303 123 1113).