In Bromley, some secondary schools require parents to complete a Supplementary Information Form (SIF) when applying for a place. This information will be specifically noted in the "applying for a school place" booklet, which provides details on the schools needing an SIF.
Unfortunately, the specific schools that require a SIF are not listed in the available records, so I recommend checking the applying for a school place booklet to find out which schools necessitate this form. It's important to refer to this booklet as it contains the accurate and current information about the admissions process.