Wales opened their RBS 6 Nations Championship campaign with victory over England at Twickenham last weekend while Scotland stuttered to a disappointing 27-6 defeat at home to France.

But the message from the coaching staff this week is that Scotland will arrive in Cardiff wounded and determined to repeat last year's emphatic triumph.

The Welsh scrum and lineout were crushed as the powerful Scotland pack laid the foundations for a comprehensive 21-9 home victory.

"Scotland are going to pose a huge threat from the physical size of their side," said McBryde.

"It's going to be a huge challenge - remember what happened in our last 6 Nations match against them. We are only too aware of how good they can be.

"They will have taken heart from the first 40-50 minutes of their performance against France."

Tight-head prop Adam Jones endured a torrid afternoon at Murrayfield last year and did not start again for Wales until the summer tour to Australia.

"I had a bit of a nightmare up there last year, but I think I have improved quite a bit since then. I'm not thinking about what happened a year ago, I'm just looking forward to Saturday," said Jones.

"They have a good scrum and went well against France. They have a big unit, with two massive second rows, but we'll be confident because there's nothing to be gained from fearing them."

Scotland have made two changes to the side beaten by France, with Kelly Brown coming in at number eight and Chris Paterson starting at full-back in place of the injured Rory Lamont.

Paterson's sheer presence in the Scotland side puts pressure on Wales not to concede careless penalties.

The versatile Gloucester back finished the World Cup with a 100 per cent record and in last year's clash with Wales he landed a record-equalling seven from seven.

James Hook produced a faultless kicking display of his own as Wales won at Twickenham for the first time since 1988 - but he took up the theme from McBryde and insisted there is no danger of Wales resting on their laurels.

"It is brilliant to have won at Twickenham after 20 years and we are delighted - but right now we have to look ahead to Scotland," said Hook.

"This is a big 6 Nations for us now after making a great start and if we lose to Scotland it will all go down the pan.

"I played against Scotland for the first time last year, they are a hugely physical side and we lost.

"I am expecting a big challenge. Chris Paterson is a great goalkicker and we don't want to be giving away silly penalties like we did against England."