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You can argue that your photo amounts to personal data because it is something from which you can be readily identified. In that case the employer would have a duty to adhere to a number of data protection principles, one of which is to process the data for a legal purpose for which it was initially obtained. That means that if the photo was obtained to represent you as an employee of the company and placed on their site for that reason, once your employment terminates and the reason for which the photo was taken no longer applies, the employer should not keep it or use it for any longer.
You can first contact them and tell them that they are likely breaching the Data Protection Act with their actions and ask them again to take it down. If they refuse you can report them to the Information Commissioner’s Office but forcing them to take it down may be difficult and you won’t be able to claim any compensation unless you have suffered any losses as a result, which is unlikely. So try to make them act by asserting some pressure and threatening to take the matter further, such as to the ICO.
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