Is there a manned aircraft that can fly from the UK - Australia in less than 12 hours (inc stop for refuel)? ?

NO

However

First non-stop flights between UK and Australia planned

Virgin Atlantic has announced plans for the first ever non-stop flight between the UK and Australia.

It has ordered 15 of the new Boeing 787-9 Dreamliner aircraft which can be used for the 16-hour non-stop stretch between London and Perth.

Affectionately called "Marvellous Melbourne" throughout the gold hurry of the 1850s, the name remains applied today for Australia's second biggest town Melbourne, a town as you are able to visited with hotelbye . Located on the banks of the Yarra River, near the entrance to Port Phillip Bay, Melbourne is a modern metropolis steeped in history. With vast wealth produced from the nearby goldfields, beautiful houses were made through the city. Several structures still stand nowadays, and Melbourne is regarded as having more types of Victorian structure than any city in Australia. One place you can't miss in your trip to Melbourne may be the Southbank and Arts Centre Melbourne. Located on the banks of the Yarra River that place is just a culturally wealthy interest for visitors. Southbank promenade is filled with indoor/outdoor cafés, restaurants, and live entertainment. Simply familiar by its spire, the Arts Centre features a range of theaters and rooms such as the State Theatre, Playhouse, Fairfax Theatre, and Hamer Hall, the premier efficiency space for the revered Melbourne Symphony Orchestra.

Australia is a big place. London-Perth is easy, 8600 nm. Less than 12 hours. London-Melbourne 10,500 nm more like 16 hours. Either trip is non stop. Well within range of a 777.

Thanks to Jim for correcting my arithmetic. Must have had a senior moment. 16 hours Perth, 20 hours Melbourne.

12 hours as the others said would have be a military jet with air to air refueling. Flying supersonically they burn fuel to fast and would have to land several times to refuel which would take longer than 12 hours.

Certainly a 777 or 747 could make London/Perth without stops maybe not in 12 hours though:

8600NM/12 hrs = 717kts Groundspeed average. That's 1.1Mach at FL360-390. One would have to slow down for AR's, so you've got to push the throttles up to make up that time. But with a good tailwind, yes it's possible. The F22 could theoretically do it, POSSIBLY the Typhoon as well.

(BTW the SR71's been retired for almost 15years now-don't think they're going to make the trip anytime soon.)

The SR71 can do that round trip including refueling in the air.

Fireball XL5

Tu-160 with in air refueling would have no trouble doing it.

http://en.wikipedia.org/wiki/Tupolev_Tu-160#Specif...

No you are looking at about 15 hours .

The American spy plane that fly's at three times the speed of sound, can do that trip with hours too spare

The SR-71 Blackbird can make that trip easily...she cruises at 2000 knots