"It may be that the release of the report would in fact have had no adverse effect on the economic interests of the developer but, as we have found, it was subject to confidentiality provided by law because there were reasonable grounds for saying its release would damage their economic interests. It is clear therefore that the confidentiality provided by law was there to protect a legitimate economic interest…"
"Determine harm. Legitimate economic interest also implies that the exception may be invoked only if disclosure would significantly damage the interest in question and assist its competitors"