If you rent, own a flat or share an entrance, explain your role in the enquiry. A person reporting water overflow may not be the person authorised to approve work on that gutter. Check who needs to be contacted and avoid assuming ownership from where the drip lands. We do not decide responsibility for building parts through a cleaning quote.
Supply the Kilburn postcode and describe the building sides involved. Keep relevant management or landlord contact details available. A simple note of the permissions still needed is more useful than guessing that all residents have agreed.