Sydney is 9, 10 or 11 hours ahead of London, depending on the time of year.
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Quick reference
| SYDNEY | LONDON · LATE OCT–LATE MAR | LONDON · EARLY APR–EARLY OCT | LONDON · IN BETWEEN |
|---|---|---|---|
| 9:00 am | 10:00 pm previous day | 12:00 am | 11:00 pm previous day |
| 12:00 pm | 1:00 am | 3:00 am | 2:00 am |
| 3:00 pm | 4:00 am | 6:00 am | 5:00 am |
| 6:00 pm | 7:00 am | 9:00 am | 8:00 am |
| 9:00 pm | 10:00 am | 12:00 pm | 11:00 am |
Questions
11 hours from late October to late March, 9 hours from early April to early October, and 10 hours in between (late March to early April, and early October to late October).
10pm the previous day from late October to late March, 12am from early April to early October, and 11pm the previous day in between (late March to early April, and early October to late October).
Yes, both, on different dates. Sydney moves to AEDT (UTC+11) in early October and back to AEST (UTC+10) in early April; London moves to BST (UTC+1) in late March and back to GMT (UTC+0) in late October.