Strangely, this bloke didn't mention once, moving the hand on the fore-end to increase/decrease stock length, and he seems to know what he's talking about.
This article is taken from Fieldsports Magazine website. See the section highlighted in Red. He even mentions wearing thicker clothing in the winter. Funny that?
I suppose that as he isn't spouting promotion for his new, radical shooting method DVD, or won a World Championship, he lacks credibility??
The phrase "Don't believe the hype" springs to mind. Many people (still) think the worlds is flat, but that doesn't make it right.
Isn't it about time we remembered there's a lot of impressionable beginners on here and actually tried to help them, instead of having a laugh at their expense?
Santa 2512 asked a serious question, below is a serious answer, and the reasons why, but make of it what you will in the knowledge that you will work it out eventually for yourself. (Perhaps?) 
I will not comment any further on this subject as I have a life.
Gun fitting - with Simon Ward
Simon Ward on the simple route to better shooting - getting your gun fitted. Here he explains the benefits of having a gun that fits you properly and what to look out for.
The Greats always knew it, but increasingly more and more are discovering that gunfit holds an important key to good shooting.
But having a gun professionally fitted will only be of real benefit if you have learnt to consistently mount your gun smoothly and accurately onto a moving object. Your master eye is the backsight of your gun so good gunmounting is paramount to your success. I mention this at the outset in order that you get the most out of a gunfitting.
The fit of your gun comes in three stages.
Stock length
There are three important stock measurements but the one which most people refer to is the length, which is the distance from the trigger blade to the centre of the butt of the stock, normally anywhere between 14½” to 15¼”. But while these are average lengths, it should be remembered that ¼” can make a lot of difference to both comfort and accuracy. You may be partridge shooting in a cotton shooting vest in early autumn, but by mid-winter you might be wearing thermals, a thick sweater and waterproof coat, which could add anything from 1/8” to ½”. To resolve this dilemma the simple solution is to have a recoil pad fitted into your shooting vest. This will automatically add anything up to ¼” which will compensate for not wearing your usual winter shooting garb. It will also give you kinder shooting on those hotter days.
Gunmounting is difficult with a short stock - the gun is not so controllable and likely to give the user some knocks. While a stock which is too long will result in the user mounting the butt onto the end of his/her arm as opposed to in the shoulder pocket. In which case both the cast and drop measurements will work against you, and definitely not for you.
Your master eye will be out of alignment at the breech, looking down the side of the rib rather than the centre. The eye will be lower than it should be, the drop measurement increased, the cast in effect reduced.
I mentioned that there were three stock measurements - centre, heel and toe. Reducing the toe measurement can be helpful for ladies or men who are fuller in the chest, and make it easier to achieve good contact in the shoulder pocket.
