Laden with game-breaking riches from players like Shane Williams, Gavin Henson and Dwayne Peel, Wales head for Edinburgh this weekend and stage four of a Grand Slam mission.

Amid the tries, adventure and occasional genius though, Wales have built a defensive barrier bettered only by England in this seasons tournament.

Weve conceded three tries, one per game I suppose, and in the modern game and taking into account the quality of opposition you are playing against, then weve got to be really content with that, said former Wales rugby league boss Griffiths, now a key part of Mike Ruddocks coaching staff as defence specialist.

After the 11th minute in Paris we were two tries down and facing a long haul, but the scramble defence and last-ditch tackling was superb.

Thats the key, the speed with which you get back, so you dont see defenders being overtaken by support runners.

You get into scramble defence when there are turnovers and breaks against you. It is one of the hardest aspects of any defence.

But it is something you practise, its not something that happens just by turning up on the day.

We practised it prior to the French game because we were playing against an extremely potent attacking force, and sometimes they are going to turn you, he added.

Weve got a great attacking machine, as we all know, now we are able to draw on this other part of our game to help us in those sticky moments.''

The challenge now for Griffiths and company is to ensure Wales do not undo all their hard work by coming unstuck against a Scottish side that is clearly struggling.

We are preparing for a big target game off the set-piece, via their back-row and midfield, Griffiths added ahead of Sundays clash.

Scotland seem to play off that, and then get a second wave of runners coming through, people like Simon Taylor, Stuart Grimes and Gordon Bulloch.

They are very conservative in their approach. They have a big kicking game and they aim to upset the set-piece and particularly the lineout, which is the core of their game.

It is a sin to look forward to Ireland (a potential Grand Slam showdown on Saturday week). The old cliche is right - concentrate on the game in front of you.