England set up a climactic final day to the 2015 RBS 6 Nations but only after toiling to a 25-13 victory over Scotland in another afternoon that signposts disappointment at the looming World Cup.
Two weeks after succumbing to champions Ireland, Stuart Lancaster's men were forced to draw on their reserves of character to see off opponents searching for a maiden win of the Championship and a first triumph at Twickenham for 32 years.
Only George Ford's 44th-minute try separated the rivals for most of a second half controlled by England but also containing moments of high anxiety as Scotland, sensing a special result was theirs for the taking, ran with intent and ingenuity.
They deservedly led 13-10 at half-time after Mark Bennett crossed to help overhaul Jonathan Joseph's early try, the outside centres exchanging scores, but they lacked the firepower to finish the job.
The 12-point win against the Six Nations' bottom team, combined with Wales' 23-16 victory over previously unbeaten Ireland earlier in the day, has created a three-way shoot-out for the title.
England, Wales and Ireland can each be crowned champions next Saturday, but the 2015 World Cup hosts know they squandered a glorious chance to place themselves in the driving seat.
As many as five try-scoring opportunities were left on the Twickenham turf, most of them in a dominant opening quarter, and it took Jack Nowell's try with five minutes left to place them at the summit of the table with one round remaining.
France visit London in the final match of Saturday's triple-header and with the outcome of the title likely to be decided by points difference, England's four-point advantage over Ireland is a poor return from an afternoon that began with such promise.
The dismal starts that had blighted their Six Nations appeared to be a distant memory as Ben Youngs and Ford combined to set Luther Burrell free, and although the inside centre butchered the chance, the Scots' line soon cracked.
Hard yards from Billy Vunipola and James Haskell softened up the visitors and Joseph needed no second invitation to jink over from 10 yards out after being given a sniff of the whitewash by Youngs' distribution.
Scotland were being over-run, with a one-booted Mike Brown unable to outstrip Stuart Hogg in a race to the line, obviously impeded by having to run with only a sock on his left foot.
Finn Russell was flattened by Courtney Lawes behind his own line and Nowell dashed into space as the pressure continued, but chances were being wasted at a worrying rate.
Any thoughts of a cricket score quickly evaporated as Scotland ran in a try launched from a line-out but born out of the vision of Greig Laidlaw, whose rapid miss pass enabled Mark Bennett to step inside and dive over.
Ford and Laidlaw exchanged penalties, the Scots' three points coming after they were held up just short of the line, before Anthony Watson correctly had a try disallowed following a forward pass from Ford to Burrell.
England invited pressure on to themselves when Joe Marler was penalised at the scrum for a second time and the visitors were now the dominant force, running the ball with intent.
Wide open space greeted revitalised Scotland, who were denied a try when wing Tommy Seymour was brought down by Brown before failing to create a clear overlap, but they at least finished the passage of play with a Laidlaw penalty.
England started the second half with purpose and were rewarded when Ford dummied his way over from close range, but it had been the hard running of wing Nowell that made the real yards.
Holes continued to appear in the blue wall as England wrestled back control, Ford underlining their growing authority with a penalty.
The Red Rose's ability to self-destruct remained intact, however, as substitute hooker Tom Youngs flung out a wild pass having charged through a gap.
It became Brown's turn to see a try chalked off for a forward pass - Haskell's ball was at least a metre in the wrong direction - but the reward for their late superiority came in the 75th minute when Nowell darted over in the left corner.
The try had a hint of good fortune about it as a penalty by Ford struck the left upright and fell for England to launch an attack that has placed them at the summit of the table.