The 352 service runs at 20 minute intervals to North Bromley from Savacentre. It is an 8 to 12 minute run to the bus stop at Bouverie Lodge at the end of Blakeney Road. This is just four minutes walk round the corner from Beckenham Junction.
You only have to decide whether to walk to the Savacentre or catch a 356 bus to get there. When your timings are right this is probably fastest.