It must also publish an action plan to mitigate any future delays to FOI enquiries.
A Lewisham Council spokesman said: “We wholly accept the enforcement notice from the Information Commissioner’s Office and recognise our current performance in responding to freedom of information requests is not acceptable.
“We are already taking steps to address this, including bringing in extra staff to focus on resolving older cases. We are fully cooperating with the ICO and will be publishing our improvement plan in due course.”