|RBS Six Nations: Wales v England|
|Venue: Millennium Stadium, Cardiff Date: Friday, 6 February Kick-off: 20:05 GMT Coverage: Live on BBC TV, HD, Red Button, Radio 5 live, BBC Radio Wales, Radio Cymru, the BBC Sport website, S4C online, mobile, the BBC Sport app and Connected TV.|
Former England prop Phil Vickery and ex-Wales back Dafydd James have warned England over George North's potential impact in Friday's Six Nations opener.
Vickery says he has seen wing North playing "at a level which I don't think I've seen anybody play".
Coach Warren Gatland has said British and Irish Lion North has not played well for Wales in "the last few games".
"I disagree with Warren Gatland over George North," countered former British and Irish Lion James.
"He has been exceptional for Northampton and I think there's a lot of kidology to bring out the best of him... I hope he will rise to it."
Vickery, also a former Lion and a 2003 World Cup winner, was particularly impressed by North's four-try display in Saints 34-6 win over Ospreys in Europe in October, 2014.
|Wales' Six Nations fixtures:|
|Friday, 6 February: England (Cardiff)|
|Sunday, 15 February: Scotland (Murrayfield)|
|Saturday, 28 February: France (Paris)|
|Saturday, 14 March: Ireland (Cardiff)|
|Saturday, 21 March: Italy (Rome)|
"I watched someone there playing a game of rugby at a level which I don't think I've seen anybody play the game at and that was George North," said Vickery.
"It was unbelievable. I was blown away.
"I don't know about consistency and is he bringing it to the Welsh team.
"All I know is as a rugby fan and a proud Englishman at Franklin's Gardens, v Ospreys, he made 97.5% of the people on that field look ordinary."
James added: "What you have with Northampton is the way that they play the game and it's suited George North and as you can see by the way he is scoring his tries."