Even the OS data -- at least what I can see in Aurora -- might not be as complete as where someone has taken an interest in a new development, such as one near

Even the OS data -- at least what I can see in Aurora -- might not be as complete as where someone has taken an interest in a new development, such as one near here. The OpenData building shapes are a good start, but they appear to have been auto-generated, and usually need correcting from up-to-date satellite imagery, if not a survey.