France's match-winner Dimitri Yachvili warned Grand Slam rivals Wales and Ireland that Les Bleus are prepared to carry on winning ugly if it means retaining their treasured title.
Both Wales and Ireland recorded heavy RBS 6 Nations victories over the weekend while France, for the second consecutive week, escaped with a victory that owed more to the opposition's failings than their own skill.
Scotland lost the chance of a draw in Paris last week when Simon Danielli attempted to run the ball out of defence with only minutes remaining and Damien Traille charged down a rushed clearance to steal the victory.
At Twickenham on Sunday France trailed 17-6 and by two tries to nothing after 40 minutes and yet emerged victorious despite showing very little creativity thanks to a combination of English profligacy and ill-discipline.
Wales travel to Paris next weekend before France face Ireland in Dublin - two matches which will go a long way to deciding the destiny of the title, if not the Grand Slam.
''It is very tight. Wales and Ireland are the best ever. We have to take care in two weeks in Paris against Wales because it will be a very big match,'' said Yachvili.
''After Sunday we will be very confident. We will try to win and to win the tournament.
''We have not played very well but we have won the two matches. I would be happy to play this way through the tournament.''
What France lacked in style, they made up for in nous and spirit.
Captain Fabien Pelous ensured their fragile confidence remained intact and France emerged for the second half with a definite gameplan, aimed at squeezing the composure out of England and working back that deficit.
While Charlie Hodgson and Olly Barkley squandered six penalties and a drop-goal chance between them, the England back row were persistently conceding penalties at the breakdown - and Yachvili was all too happy to slot them over.
The former Gloucester scrum-half, who kicked 19 points to beat England last year and secure France the Grand Slam, landed six from eight to teach the English kickers a stark lesson.
Yachvili's only aberrations were to hit the post with one long-range effort and watch another speculative kick fall short from halfway - all from a player who had been dropped for the Scotland game.
''I love kicking - and not just against England,'' he joked afterwards.
''I was confident and I kicked quite well but it was all because the team worked so hard. It was good for me and good for the team. I am very happy and very proud.
''We didn't play in the first half. The English put pressure on us. They also attacked very well but at half-time we said 'We have to attack more, to put more pressure on' and I think we did well.
''We showed a lot of heart, a lot of aggression and that is why we won. We try to defend well, to put pressure on the team and that is why we won.''
And what an historic victory it was. Not since Abdel Benazzi's side in 1997 staged their own remarkable comeback from 20-6 down to win 23-20 had a French team won at Twickenham.
The players celebrated like the championship was already won and France coach Bernard Laporte charged onto the field to hug and celebrate with his players.
Serge Betsen, who put in a monumental defensive performance from blindside flanker, said: ''Most of the players have never won at Twickenham before which is why most of the players celebrated like that.''
So surely Yachvili has done enough now to convince Laporte against making another change at scrum-half?
''It is a good win for the players but we will have to see what happens in the future because you don't buy your French shirt, you rent it,'' he said.
England Under-18 head coach John Fletcher insists his young side will be better for the experience after beating Italy in the bronze final to round out their 2015 Rugby Europe U18 Championship campaign in style.