Farrell's majestic pass and Daly's exhilarating finish settled a match worthy of inclusion amongst the Six Nations' greatest, an occasion as momentous as any since the whole Wales-England thing kicked off at Mr Richardson's Field in Blackheath 136 years ago.
Since the advent of the RBS 6 Nations nobody has managed the ultimate consistency of defending one Slam by securing another. Such has been the sheer competitive ferocity of the Championship that not even Europe's one World Cup-winning team, England's of 2003, could achieve back-to-back clean sweeps.
With time running out in Cardiff last Saturday night, Eddie Jones' squad were in imminent danger of suffering the same fate as Sir Clive Woodward's. Just as his crack at a double Slam disintegrated in the face of Ireland's assault at Twickenham thirteen years ago, so Jones' was about to hit the buffers in territory where more than one winning English chariot had come to grief.
Wales, five points ahead with fewer than five minutes left, had moved to within sight of ensuring that history would repeat itself. Four years earlier they had defied the odds by preventing Chris Robshaw's team from being anointed Grand Slam champions.
And by the time they had finished, Wales had replaced their neighbours at the top of the table, seizing the title as due reward for daring to stretch their winning margin that night to an unprecedented 27 points. And there they were, about to defy the odds again and ensure that New Zealand's world record of 18 straight wins would still be safe in All Blacks hands.
Succeeding on that scale requires many priceless qualities, not least mastery of the art of escapology. Having found a way out of the tightest of corners, England extended their winning streak to 16 with Italy at home next week in Round 3 followed by Scotland at Twickenham in Round 4.
They may have been aided and abetted by one wayward Welsh kick but turning it into a full seven points demanded nothing less than perfection. George Ford, born a few weeks after Emyr Lewis and Ieuan Evans famously derailed Will Carling's team from a third straight Slam in February 1993, did his bit as soon as the Welsh manna from heaven had fallen into his lap.
One swift pass to his left, another from Farrell so perfect in every respect that it sent Daly shooting outside his marker to the corner and Wales hardly knew what had hit them. Even then they still had time to get within drop goal range for a draw which would have left them feeling justifiably short-changed until that scenario vanished with Farrell's spiraling touchline conversion.
As a shining example of the game at its very best, the tournament could not have wished for a more inspirational occasion providing, from start to finish, incontrovertible evidence of what makes the RBS 6 Nations unique among international events across the globe.
It produced more than its share of collisions colossal enough to have kept the Richter Scale on an upward curve.
And in spite of that the professional gladiators honoured the old amateur ethos by paying dutiful respect to the spirit of the game.
Even when, inevitably, one Englishman, Farrell, fell victim to a marginally late Welsh tackle, from the mighty Ross Moriarty, there were no histrionics. Instead of finger-pointing, there was an automatic acceptance that it hadn't been done with malice aforethought.
Players on both sides deserved the praise showered upon them but the same ought to apply to the man in the middle, Jerome Garces. The French referee rose to the challenge magnificently, his empathy with the players and ever-ready smile sure signs of a man at ease with himself, no matter how intimidating the atmosphere.
A week's break will allow vast audiences amongst the RBS 6 Nations and countless millions more at large in the rest of the world to take a breather. Never mind the players, the fans also welcome a temporary truce to take tock, reflect on what's happened so far and wonder what's to come.
The opening two rounds have put this year's event on track to equal, or even supersede the 75-try record as the most over the course of the 15 matches - an average of 15 per round. The first two weekends produced a grand total of 28.
In bagging the first try-bonus point during their Roman visit last week, Ireland broke all manner of records, not least with a double hat-trick. CJ Stander's was the first by a forward since Michel Crauste delivered all three tries from the back row for France against England at Stade Colombes during the 1962 Five Nations.
Craig Gilroy's second Irish hat-trick, hard on the heels of Stander's, took the Ulster wing all of 14 minutes. It may have been the fastest by an Irish player but not in RBS 6 Nations.
Austin Healey set the pace during the inaugural season at the Stadio Flaminio in 2000 when his threesome came in twelve minutes - fast, but not that fast. In Rome two years ago, George North made short work of that, dotting down his hat-trick for Wales in ten minutes, five seconds.
Scotland, next up for Wales at BT Murrayfield on February 25, stumbled into a hat-trick of their own against France in Paris, this one inflicted upon them by recurring injury. It meant that before half-time the captain's armband had passed from Greig Laidlaw to John Barclay and on to Jonny Gray.
Typically, Vern Cotter's team took the disruption in their stride and went close to following their wonderful win over Ireland with another at a venue where they have not win since the end of the last century. Despite outscoring France 2-1 on tries, they had to make do with the scant reward of a losing bonus point.
Their near miss the day after Wales came up agonisingly short leaves five of the Six in contention for the title. The bonus-point effect has put Ireland clear in second place with England, due in Dublin next month on 'Super Saturday', the only team to negotiate the first two hurdles without coming to grief.
Back-to-back Grand Slams have only been achieved twice since the end of the Second World War:
1991: beat Wales (Cardiff) 25-6, Scotland (Twickenham) 21-12, Ireland (Dublin) 16-7, France (Twickenham) 21-19.
1992: beat Scotland (Edinburgh) 25-7, Ireland (Twickenham) 38-9, France (Paris) 31-13, Wales (Twickenham) 24-0.
1997: beat Ireland (Dublin) 32-15, Wales (Paris) 27-22, England (Twickenham) 23-20, Scotland (Paris) 47-20.
1998: beat England (Paris) 24-17, Scotland (Edinburgh) 51-16, Ireland (Paris) 18-16, Wales (Wembley) 51-0.