ocr: How to find Bromley High School GPDST M25 Junction 3 - 80 5 miles west on the A20. Join the. A222 at the 2nd intersection and proceed south-west towards Bromley. %of: a mile after Chislehurst Station turn left into Blackorook Lane: at the mini roundabout. The School is on the left. M25 Junction 4 : go 5 miles west on the A21. Atl Bromley Common turn right along Magpie Hall Lane, continue for 1% miles toa a: staggered junction; come out on Southborough Lane, turning right at the mini roundabout. The School is on the: right. Nearest stations are Bickley or Bromley South for Victoria, North and M ...