OSL - SYD Approx £2200
Not sure if this is a good price or not (or even if it has been published before) but I'm finding Oslo to Sydney via London/Singapore on BA and BA/Qantas for less than £2200 in Business (J and I). A380 or 777. Example dates Out 30th January - Return 1 March. ITA shows lots of other dates available at around this price. Also possible with return from Bangkok.