Remember the old saying you cant teach an old dog new tricks.
Which is piffle, people stop learning when they can't be bothered anymore or its too much effort, at which point they should retire of get a job at B&Q.
As I say, I have been working along side some long term spakies, and they are very set in thier ways, and when there is a change, such as the introduction of the 17th edition they fail to take the time to learn to understand the changes and the reasons behind them.
On old boy has started putting RCD's on everything because of the 17th - even for a length of surface mounted SWA in a commercial premises
Not everyone is the same, even if experiance has shown you that all BMW series 5 drivers make money from dealing in illicent substances or all irsh brickies like a drink on a friday evening it is not a fact and you MUST remain open to prejudices formed from your own experiance.
Note: attempt at light humour has been made during the writing of this post, no offence is meant to anyone, especially old people working at B&Q