If your coming from Manchester have you considered Emirates..don’t know about their economy service but their business class is as good as first class on some other major airlines

No, their business class is dated and poor quality, thats not to say the service is bad, but poor seating. Out of MAN the best business class on the route would probably be SIA, although the business class product of Etihad and Qatar is good, and better (in terms of seat/space etc) than Emirates, but I don’t think they do Perth to connect to.

MAS have 34-inch seat pitch, as do Air New Zealand now, so a trip to LHR and then via NZ to Oz may be possible, albeit it would be a long detour just to go at 34-inch.