I would say that you should consider checking whether the councils and/or these planning portals operate under an Open Government Licence : https://en.wikipedia

I would say that you should consider checking whether the councils and/or these planning portals operate under an Open Government Licence : https://en.wikipedia.org/wiki/Open_Government_Licence https://en.wikipedia.org/wiki/Open_Government_Licence . These in theory permit commercial use. I would also see that there is a strong case to say that it is aggregation. Something that would help is redirecting users to the original source content whenever you are referencing it within your search.