British Summer Time vs. Sydney time difference

a different time zone is observed in this locationWhen Daylight Saving Time ends GMT (Greenwich Mean Time) will be observed inplace of BST.
British Summer TimeSydney
03:45 am Mon, 23 Sep

(UTC/GMT +10)
12:45 pm Mon, 23 Sep

5 am2:00 pm
7 am4:00 pm
9 am6:00 pm
11 am8:00 pm
1 pm10:00 pm
3 pm12:00 am next day
5 pm2:00 am next day
7 pm4:00 am next day

British Summer Time is 9 hours behind Sydney, Australia

3:45 am Monday, British Summer Time (BST) is
12:45 pm Monday, in Sydney, Australia
Convert time between BST and Sydney, Australia   

Time difference between BST and Sydney, Australia is 9:0 hours

BST is 9 hours behind Sydney.
8:00 am in BST = 5:00 pm in Sydney.