In my humble opinion Wales will win the Grand Slam on Saturday.

There is little doubt that it will prove to be one of the most exciting ever, but also one of the most unlikely. Show me a person who saw it coming and I will show you a liar.

Yes, we knew Wales were a good side - we discovered that at the last World Cup when they stunned everyone with their performances against New Zealand and England - but a Grand Slam? Come on! There have been some very good sides down the years who have not managed this ultimate achievement in Northern Hemisphere rugby - Clive Woodward's English World Cup winning team only did it once - so it will make the achievement all the more remarkable.

The one 'but' is the question of whether Wales can handle the pressure. That England side bottled it on three occasions at the final hurdle, and, of course, Wales have to overturn the scarcely credible fact that they have not beaten Ireland in Cardiff since 1983.

But history meant nothing last weekend at Murrayfield as Wales won there for only the second time in twenty years in a quite scintillating game of rugby, the like of which we have not witnessed in the Northern Hemisphere for many a year. In fact if my hazy memory of my early years is correct I cannot recall the great Wales team of the 1970s playing rugby anything like as free-flowing or as riveting as that. Some of the passing and movement in the first half was awe-inspiring.

There is another 'but' though: Scotland were dire, absolutely awful. If a Six Nations' team has produced a more nave and apathetic half of rugby than that first half then it has escaped everyone's memory. In the build up to the match they must have talked endlessly about not kicking poorly to Wales' nippy back three.

So what do they do in the first couple of minutes?

Hugo Southwell scuffs a hopeless nothing of a punt straight at Shane Williams, with time to spare and acres of space in which to run. Then a succession of embarrassing missed tackles began, with Ryan Jones running between the two Scottish second rows.

And so the procession of tries began. In fairness to Jones I thought he was outstanding - and that surprised me a little, I will admit. Previously I was not sure that he was made of the right stuff for international rugby, but he has now proved that he most certainly is.

As well as running strongly with ball in hand he also made 18 tackles in Scotland, which is more than anyone else has made in a Six Nations match this season.

Scotland's poor tactics reminded me of a Glamorgan match back in 1995. A NatWest Trophy semi final match in Cardiff against Warwickshire, every bit as calamitous for us as this was for the Scots. Our pre-match meetings had centred around the fact that we must not attempt any quick singles to Trevor Penney, the electrically quick backward point who was on fire at the time. You know what happened? We were shot out for 86, with Matthew Maynard and David Hemp both run out by Penney when looking well set! Sometimes if you over-emphasise a point it can overwhelm your thought processes.

Which is why Mike Ruddock will be banning talk of the Grand Slam this week. It would be like me talking about scoring a hundred before the game has started. You just cannot do it. You must go through the same processes as you have done previously and forget about the final reward. That will come if you do the little things properly.

Having said that, when we were in with a chance of winning the County Championship in 1997, Adrian Dale did mention on a couple of occasions - in jest - that we would attain "immortality in the Principality" if we did win the championship.

That sort of banter will be difficult to stop among the players this week.

There might even be a passing, jocular, mention of the bonuses on offer - it is a professional game after all, and money does come into it, like it or not.

Indeed, Dale was often the man being harangued about such things at Glamorgan as he was always in charge of the players' kitty into which all bonuses were paid and then shared out.

But, of course, cricket does not have the profile of rugby and I doubt very much whether that Glamorgan team of 1997 have achieved sporting immortality by our achievement, but if this Wales team do win on Saturday, there is little doubt that their names will become immortal, just like those of the seventies.