4 buses an hour is overnight when Brixton tube isn't open anyway. You're notorious for saying that anything that isn't a tube is rubbish, and for demanding stuff that actually already exists (secure bike parking at Peckham Rye, a regular bus from east Dulwich to Brixton...). You've made it clear you won't be happy until there's a tube station close (but not too close!) to your front door, regardless of how many trains and buses and cycle routes there are - but if a tube is that critical to you, why did you come or stay in east Dulwich?