Lets start with what you can book easily....
Oslo (OSL) to Sydney (SYD) — Tue, Nov 10
Long layoverOvernight flight
Oslo (OSL) to London (LHR) — Tue, Nov 10
British Airways 765
Dep: 2:40 pm
Arr: 4:10 pm
2h 30m
Airbus A320
Business (J)
Meal
Layover in LHR
5h 35m
London (LHR) to Singapore (SIN) — Tue, Nov 10
British Airways 15
Dep: 9:45 pm
Arr: 6:35 pm
12h 50m
Boeing 777
Business (I)
Meal
Stop in SIN
Wed, Nov 11
1h 30m
Singapore (SIN) to Sydney (SYD) — Wed, Nov 11
British Airways 15
Dep: 8:05 pm
Arr: 6:50 am
7h 45m
Boeing 777
Business (I)
Meal
Thu, Nov 12
Sydney (SYD) to Oslo (OSL) — Thu, Nov 19
Overnight flight
Sydney (SYD) to Singapore (SIN) — Thu, Nov 19
British Airways 16
Dep: 4:30 pm
Arr: 9:30 pm
8h 0m
Boeing 777
Business (R)
Meal
Stop in SIN
1h 25m
Singapore (SIN) to London (LHR) — Thu, Nov 19
British Airways 16
Dep: 10:55 pm
Arr: 4:55 am
14h 0m
Boeing 777
Business (R)
Meal
Layover in LHR
Fri, Nov 20
2h 35m
London (LHR) to Oslo (OSL) — Fri, Nov 20
British Airways 762
Dep: 7:30 am
Arr: 10:40 am
2h 10m
Airbus A320
Business (J)
Meal
I can't find anything with all BA flight numbers yet, but I can find this CX fare... (EUR 3208)
Bergen (BGO) to London (LHR) — Tue, Nov 10
British Airways 757
Dep: 12:05 pm
Arr: 1:25 pm
2h 20m
Airbus A319
Business (I)
Meal
Layover in LHR
3h 50m
London (LHR) to Hong Kong (HKG) — Tue, Nov 10
Cathay Pacific 238
Dep: 5:15 pm
Arr: 12:50 pm
11h 35m
Boeing 777
Business (I)
Breakfast, DinnerMovieTelephoneIn-seat Video Player
Layover in HKG
Wed, Nov 11
2h 5m
Hong Kong (HKG) to Perth (PER) — Wed, Nov 11
Cathay Pacific 171
Dep: 2:55 pm
Arr: 10:35 pm
7h 40m
Airbus A330
Business (I)
Lunch, RefreshmentsMovieTelephoneIn-seat Video Player
Perth (PER) to Sydney (SYD) — Thu, Nov 12
Qantas 576
Dep: 7:05 am
Arr: 2:15 pm
4h 10m
Boeing 737
Business (I)
Breakfast
Sydney (SYD) to Hong Kong (HKG) — Tue, Nov 17
Cathay Pacific 110
Dep: 8:45 am
Arr: 2:55 pm
9h 10m
Airbus A330
Business (I)
Breakfast, LunchMovieTelephoneIn-seat Video Player
Hong Kong (HKG) to Bergen (BGO) — Wed, Nov 18
Overnight flight
Hong Kong (HKG) to London (LHR) — Wed, Nov 18
Cathay Pacific 255
Dep: 1:00 am
Arr: 6:20 am
13h 20m
Boeing 777
Business (I)
Breakfast, DinnerMovieTelephoneIn-seat Video Player
Layover in LHR
2h 5m
London (LHR) to Bergen (BGO) — Wed, Nov 18
British Airways 758
Dep: 8:25 am
Arr: 11:25 am
2h 0m
Airbus A319
Business (I)
Meal
I would do this one for the CX J class seats alone...