Answer:
The 16:59 from Victoria is a good train to Bromley South.
If you want to go to Bromley North, then you may have to change at Grove Park.
A car is good, a helicopter is even better but alas Bromley is short of helipads, so forget an air drop into the area.
Best get a cab.
BTW: Would have helped if I knew where from!! Just a tip.