That’s 2 13 hour flights. Each way. Doable in 3 days, not in 2 and pretty hellish either way.
I got caught by delays and cancellations on the way back once and from stepping foot in the airport Aus side, it was 42 hours until stepping out at Heathrow.
Imagine how much it would suck if I was on the plane and knew that I wouldn't be able to make the meeting. Thanks mate, i'm going to try to avoid doing it altogether but if I can't do that at least I know its possible.
It's doable, I wouldn't bother trying to change your body clock from UK time. If it's possible to fly business then it will be a lot easier.
People react differently to jetlag though. I can generally reset myself within a day, others I know will take a week upwards.