I used to work in a design agency as a graphic designer/social media manager as an apprentice. I have done work for a client who is a take away/diner and since leaving the agency I have created new, altered images of the examples of work I created for them to use on my online portfolio. In this case I have super imposed a poster I created during my apprenticeship, onto a bus stop billboard in order to change the image and it not simply be a duplicate, in turn creating a completely new image for my portfolio.
Over the past few days I have noticed on this clients Facebook account, the design agency who I used to work for or the client themselves, have pulled all my new portfolio images for this client and are using them on the clients Facebook page.
So my question is, who owns the bus stop billboard image and other altered images of this work, as they have not asked me if they could use my new images and I have made these whilst freelancing purely for my own portfolio not client use? I have not been credited/paid for the use of these images, which comes across the agency I used to work for or the client are now claiming my new images (depending on who is currently managing the clients social media).
This is from the view point of UK law.