Unfortunately, we asked Building Control to oversee an improvement to the house, and they have noticed another job which was completed (without permission) a few years ago. They've issued us with a notification for retrospective application for that job (21 days to comply). We did that work, so have no choice but to follow through their procedure, which we will do. That, I hope, will be OK but do we actively disclose the other work that was done at the same time? Anyone been through the same? Any experience or advice most welcome! I can't see much online except for cases where the work was done by a previous owner...