The Tattersalls Autumn Horses in Training Sale has been a fruitful hunting ground for Waller and Mulcaster who teamed up to secure Mr Reckless for 240,000 guineas.
Consigned from Jamie Osborne’s The Old Malthouse in Lambourn, the three-year-old son of Reckless Abandon out of the Doyoun mare Zarabaya is rated 103 by Timeform.
"He is exactly the sort of horse we are looking for," reported Mulcaster. "We took a look at him early in the year and have been following his progress and we are delighted to get him.
"He gets the nine furlongs very well and might stretch a little further. The prize-money for races that suit him has recently gone up in Sydney, so hopefully we'll have some fun!"
Also destyined for Australia are Jack Regan and Buffalo River, both knocked down for 180,000 guineas to Australian buyers.
The Ian Williams-trained Jack Regan was bought by Australian agent Jim Clarke on behalf of Melbourne-based trainer Trent Busuttin.
The sale was a great result for owners Dominion Racing Stables who purchased the horse here one year ago for just 22,000 guineas.
Agent Paul Moroney secured the John Gosden-trained Buffalo River also for 180,000 guineas.
The two-year-old was also consigned from The Castlebridge Consignment and was purchased by Moroney on behalf of his brother Mike Moroney who trains at Flemington.
Moroney commented: "I actually saw this horse as a yearling in the US - he made my final list then.
"Buffalo River's form reads really well - he finished a good third to subsequent Group 1 winner Royal Marine on just his second start.
“He is still looks quite babyish so he will head to Australia and will be given plenty of time to chill out, six months or so, to grow up both physically and mentally."
Also heading Down Under is Leaderboard (Street Cry) after he was purchased for 70,000 guineas by John Galvin’s Fortuna Racing, owners of New Zealand's dual G1 winner Melody Belle.
The winner at 2400 metres of one of his nine starts, Leaderboard was signed for by De Burgh Equine, but it was young agent Will Johnson in charge of bidding.
Go Racing’s Albert Bosma, who has sourced Australian winners Alward and Raqeeq from this sale, purchased the lightly-tried Obelos (New Approach), a Longchamp winner from four appearances, for 32,000 guineas.
Buyers from the Middle East dominated with Archetype sold for the top price of 335,000 guineas.
The Timeform 110-rated four-year-old was purchased by Saad Bin Mishraf and Ted Voute on behalf of Prince Faisal Bin Khalid's Red Stable, the leading stable in Saudi Arabia.
Bin Mishraf said; "He is a lovely horse, the all-round package. He should suit our racing and our surface, he will be one we hope for the King’s Cup."
The King Abdulaziz Champion Cup is run in February. Jorvick, who was purchased by the same connections here in 2016 from the Juddmonte draft, finished second in this year's renewal.
Archetype was consigned by Simon Crisford's Kremlin House Stables on behalf of Highclere Thoroughbred Racing's Wordsworth syndicate.
Cheveley Park Stud’s three-year-old colt Whitlock will stay with trainer John Gosden after being purchased by Charlie Gordon Watson Bloodstock’s Will Douglass for 200,000 guineas.The Timeform 100-rated own-brother to the G3 winner and G2-placed colt Zonderland was consigned to the sale by The Castlebridge Consignment and was most recently second off a BHA Handicap mark of 87 at Nottingham