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I am afraid the complainant has the right not to have their identity revealed under data protection/GPDR laws. If it has been more than 4 years since you built the studio, you may apply for a Lawful Development Certificate as you get immunity after 4 years of building.
May I help further?
The guiding factor for the council is as follows:
"The decisive issue for the local planning authority should be whether the breach would unacceptably affect public amenity or the existing use of land and buildings meriting protection in the public interest."
The council may only take enforcement action if it is expedient to do so.
I would advise you to contact for further information and advice http://just-planning.co.uk/
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