Advice on secondary schools in and around Brighton

[Bythesea1]

Hi, we're thinking of relocating from London to Brighton in time for my eldest son to go to secondary school. I know school places are a bit of nightmare there so we're considering private options too. He's smart and sporty but probably not Brighton College material so I've been reading up on Lewes Old Grammar and Shoreham College. I'd love to hear from anyone who has experience of either, good or bad!