Coach Rob Howley says he will crack open the beer for his Wales players if they deny England the Grand Slam and retain the Six Nations title.
Wales need to win by eight points or more on Saturday (kick-off 5pm) to retain their championship crown, a position that did not likely when they were beaten at home by Ireland in their opening game, extending their losing run to eight international matches.
Since then, victories over France, Italy and Scotland - all away from home - have put Wales in a position where an eight-point victory, seven if they stay ahead on try-count, will see them retain a Five or Six Nations title for the first time since 1979.
"The players have been absolutely fantastic over the last five weeks and have put themselves in a position (to challenge for the title), after regaining momentum," Howley said.
"They will deserve a beer on Saturday night if that happens."
With wet weather forecast this weekend, Howley and England counterpart Stuart Lancaster have agreed that the roof of the Millennium Stadium will be closed for Saturday's showdown.
Howley's preparations were disrupted by the injury to captain Ryan Jones, outstanding in their last three matches.
He sprung a selection surprise by appointing Gethin Jenkins as skipper rather than Sam Warburton.
Lions prop Jenkins is fit to return to the team so Paul James drops to the bench and Justin Tipuric comes into the back row in place of Jones, though he will start at openside with Warburton switching to the blindside.
Lancaster has made four changes, with Owen Farrell fit to take back the reins from Toby Flood at No 10, whilst up front Joe Marler and Tom Youngs are restored to the starting line-up and there is a first England start since breaking his neck last year for Tom Croft.
Croft came off the bench in last week's nervy victory over Italy, and Lancaster said: "The way he played when he came on against Italy, the way he's trained, the presence he's brought to the team...tipped the balance."
Lions coach Warren Gatland added more spice - if any more was needed - by admitting he sees the Cardiff crunch as a final trial for the Lions squad.
There will be Lions battles all over the pitch, and one key match-up will be the battle for the captaincy where Warburton and Chris Robshaw - two leading candidates - go head-to-head.
Chris Ashton will be desperate to outshine Alex Cuthbert and George North, and the midfield battle will be fascinating, with Jamie Roberts and Jonathan Davies up against Manu Tuilagi and Brad Barritt, with all four potential tourists.
Lancaster says victory on Saturday would give England the belief that they can not just host the 2015 World Cup - but win it.
"To win a Grand Slam would give you that inner confidence and belief that you can win big games and finals," he said.
Wales team: 15 Halfpenny, 14 Cuthbert, 13 J Davies, 12 Roberts, 11 North, 10 Biggar, 9 Phillips; 1 Jenkins, 2 Hibbard, 3 A Jones, 4 A-W Jones, 5 Evans, 6 Warburton, 7 Tipuric, 8 Faletau.
Replacements: 16 Owens, 17 James, 18 Andrews, 19 Coombs, 20 Shingler, 21 L Williams, 22 Hook, 23 S Williams.
England: 15 Goode, 14 Ashton, 13 Tuilagi, 12 Barritt, 11 Brown, 10 Farrell, 9 B Youngs; 1 Marler, 2 T Youngs, 3 Cole, 4 Launchbury, 5 Parling, 6 Croft, 7 Robshaw, 8 Wood.
Replacements: 16 Hartley, 17 Wilson, 18 Vunipola, 19 Lawes, 20 Haskell, 21 Care, 22 Flood, 23 Twelvetrees.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.