Wales wing George North will make his first Millennium Stadium appearance for almost six months on Saturday after he "ticked all the boxes" on a long comeback trail from injury.
Wales have identified tighthead prop Aaron Jarvis as a player to provide possible emergency cover at hooker during the World Cup.
England have opted to take the away dressing room at Twickenham for Saturday's clash with Ireland in preparation for their World Cup opener against Fiji.
The tournament hosts must wear their red alternate kit and have been designated the visitors' changing room for the September 18 showdown against the Fijians, who also wear white, after losing a coin toss overseen by World Rugby last year.
As a result, head coach Stuart Lancaster has requested that his players use their final World Cup warm-up match against Ireland to familiarise themselves with the away dressing room.
England will wear their traditional white jersey for the remaining Pool A matches against Wales, Australia and Uruguay, although they will occupy the visitors' changing room against the Wallabies.
Twickenham might be considered the home of rugby but it appears Britons are baffled when it comes to some of the rules.
New Zealand have been breaking the mould since the days of Jonah Lomu. Now the All Blacks will bid to do what no team has done before and successfully defend the Rugby World Cup title.
Sam Burgess has revealed that Will Carling contacted him to explain his claim that the inexperience of England's rugby league convert would be exposed during the World Cup.
Joe Schmidt insists Simon Zebo must feature at full-back against England to be ready to deputise for Rob Kearney at the World Cup.
Chris Robshaw is convinced England have assembled a squad capable of emulating their famed forebears of 2003 by lifting the Webb Ellis Cup.