OP, you are privileged to live near London. The best way is to learn from a trading/prop firm in your area.
People who are good traders tend to be educated and disciplined. Educated people will notice poor punctuation etc. They will think something like if this guy can't be bothered how he writes his post, won't that just become a problem in other areas?
Although I generally agree with you, if you focus on the inconsequential things, you might very well miss something extraordinary.