Australian riding star Craig Williams enjoyed another day out in the British sunshine as Cotton House sprang a surprise in the feature event at York.
The 25-1 chance, trained by Mick Channon, left behind a below-par effort on her previous outing to take care of a strong field in the £52,000-added William Hill Trophy.
Cotton House forged to the front in the middle of the track and denied Railroader (20-1) by half a length with the heavily-backed 5-2 favourite Rendition a neck further away.
Williams, 23, who came to Britain to increase his riding experience, may stay in this country throughout the summer.
He was notching his sixth success since arriving.
The rider, nearing 500 career winners, had already struck in a big sponsored handicap on outsider Hunting Lion, also trained by Channon, at Newmarket two weeks ago.
'I'm not going to go back just now. I'm enjoying it too much,' he said. 'The weather is great. It's freezing cold back in Melbourne at the moment and my mates can't believe that it's so good in Britain.
'I've got off to a decent start with a bit of luck on long shots in two big handicaps but I've still got plenty to learn.
'I admire Frankie Dettori a lot and want to try to ride more in an American and British style.
'I'm not sure yet when I'll be going back but I could be here for a lot of the season. The aim is to be back home in good time for the Melbourne Cup meeting.
'Mr Channon has promised me some rides at Royal Ascot next week. But I certainly wouldn't mind a few more.'
Cotton House is owned in partnership by Channon and Michael Foy, a surgeon renowned for treating injured jockeys.
The pair both missed the success, preferring to travel to see Foy's runner Cauda Equina in action at Bath.
Cotton House did not appear to hold a strong chance, having been well beaten at Haydock last time.
But Channon's representative Lesley White said: 'It was a muddling race at Haydock and the soft ground was against her.
'Craig said if anything he hit the front too soon but he has given the filly a good ride _ he's adapting well to riding in this country.'
Sally Eddery, 36, carried off one of the most coveted prizes for lady amateur riders when steering home Pentagonal in the Queen Mother's Cup.
The 4-1 favourite, owned by Sheikh Mohammed, made much of the running and Eddery kept enough up her sleeve to hold the late spurt of Batswing by a neck.
Pentagonal was enhancing the record of his trainer Sir Michael Stoute who won this contest four times in the last decade.
Eddery, the former wife of jockey Paul Eddery, collected her weight in champagne as part of the prize for this race.
She goes to scale at 8st 4lb but managed to take home more bubbly by having her nine-year-old son Charles join her on the scales.
Eddery, a work rider for Stoute, won the big ladies' race at Ascot for the same connections aboard Hammerstein.
'It's great to win this race as well. This was my fourth attempt,' she said.
'I've worked for the trainer since I was 18. I've been lucky to ride some top horses, including the 1000 Guineas winner Musical Bliss.'
Chianti was cut to 20-1 for next year's 2000 Guineas when making a winning debut in the Leonard Sainer Maiden Stakes.
Bookmakers were well aware the the John Dunlop-trained colt had been showing up prominently on home gallops and he was sent off an 8-11 chance.
Chianti was soon at the head affairs but he had to work hard before seeing off the persistent Lost At Sea.
The colt, owned by Wafic Said, cost IR£500,000 at the Goffs Sales and is a full-brother to the top class Desert King.
'We're delighted to get that over with. It's always nerve-wracking when you've paid a lot of money for one,' said Said's racing manager Tim Bulwer-Long.
'He's just started growing and there should be plenty of improvement in him. He'll probably be kept to a conditions race next.'
Ice made it four wins from four runs at York when making all in the Cadogan Silver Salver Handicap.
The first prize in the opening race on Timeform Charity Day was shared when Boldly Goes and Friar Tuck dead-heated in the Charles Henry Memorial Handicap.
Stoute clinched a double when Alva Glen stayed on too well for the opposition in the Daniel Prenn Royal Yorkshire Handicap.
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