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"My broker had only the sketchiest knowledge of what best execution really meant..."
I am intrigued that you were surprised by this, Steve. Never mind the retail sector, who does have a firm understanding of what 'best execution' really means? The architects of Mifid plainly didn't have a clue.
As for the average retail investor, (going back to an earlier point you made about the 'comfort' of the primary exchange) how does a broker explain why you didn't get the price from the LSE?
I shop in John Lewis, not Bob's Market* in Catford (even if those clothes were both made in the same sweatshop in Vietnam).
*apologise to any real Bob's Markets, I am sure you serve the good people of Catford very well.