Hi, as I see it there are two reasonably direct options for you. Assuming you're coming from SYD, you can go QF to SIN, then connect to DEL on the QF codeshare using Jet Airways metal. From DEL to LHR you can use BA and return to Australia on QF or BA through either SIN, BKK or HKG. The connection in SIN to DEL is possible without a stopover, although you arrive v.late (or early, depending on your point of view) in DEL, around 2.20 a.m. Delhi time. Also, Jet use a 737 from SIN to DEL, so the J seat is more like a QF domestic J seat, certainly not a skybed type thing. The other option is on SQ from SYD to SIN and onto DEL. The connections work better, in my view, with an early am SYD departure and an arrival in DEL around 11 pm. SQ also now using nice 777-300ERs, which boast same J class as A380. From DEL you could use Star Alliance partners such as LH to go to FRA and then onwards. Getting back to SYD, again you could use SQ. SQ likely to be pricier, but better in my view on this itinerary. Also note, all J lounges in DEL suck.
