Englands 31-6 RBS 6 Nations defeat at the Stade de France represents their heaviest in the championship for 20 years.

Andy Robinsons men never recovered from conceding a try to Florian Fritz after just 43 seconds and their first-half performance in particular was disappointing.

England kicked poorly, dropped passes, knocked the ball on, turned over possession and conceded penalties that Dimitri Yachvili converted as France opened a 16-3 lead by half-time.

Damien Traille touched down to extend Frances lead and the win was wrapped up by Christophe Dominici after he intercepted Andy Goodes pass two minutes from time.

England lost to Scotland a fortnight ago, they have not scored a try in two matches and their championship hopes hang by a thread.

But Castaignede, the Saracens full-back, does not believe Englands decline is terminal.

That equalled the biggest margin of victory for France over England. They are down on one knee - but not both. They can still bounce back, said Castaignede.

I am not really worried for the English. I work with them every day at Saracens and they
will be okay.

I just think we found the keys to beat them. When you score a try in the first minute it is always easier to get into the game and they were under pressure all the time from us.

It was a joyous weekend all round for Castaignede. It began with Saracens ending their eight-match losing streak by beating English Premiership leaders Sale and ended with Frances record-equalling win over England.

The weekend started really well. We won in Sale and it is quite amazing. This club gives me lots of worries but I hope we have found a way to get out of trouble, said Castaignede.

But for the next week, the 31-year-olds focus has to remain with France and the climax of their RBS 6 Nations title challenge against Wales.

France are tied with Ireland on six points apiece but lead the championship table on points difference.

Ireland meet England at Twickenham, while France head to Cardiff to face a Wales side that was held to an 18-18 draw by Italy on Saturday.

I have every reason to be happy now - but the job will be done on Saturday, said Castaignede.

We must win in Wales - we want to win the Six Nations and this was very important.

Wales are a strange team, they are able to beat Australia and almost lose to Fiji. They are not consistent but they are able to play quality rugby and they have some good players.

We manage to play well against the best teams so if we want to beat them we have to be at our best. It will be a difficult game.