It almost seems that diversification might not only need to be spread across investments, but also brokers, margin lenders, etc.
I'm currently doing my Dip.FP studies and their take on diversification is much different to what I read on several forums. Most people think of share diversification as picking shares from different industry groups, then maybe spread though companies in industry groups.
Their take (makes sense) is to basically diversify everything. Investment Vehicles (Property, Shares, MF's, Fixed Int, Cash), then diversify within these vehicles, then diversify the brokers/banks used. This is their view on what all FP's and Financial Experts should be advising.
Would have helped some of these people if they employed some Margin Lending provider diversification.