Co-op Bank and Verified by Visa

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Quoting Charles Lindsey <chl at clerew.man.ac.uk>:

> 2. If so, did you examine the certificate chain attached to it, and  
> where did that chain show the screen to have come from?

Is there a single UK bank or building society that has a leaflet or  
web page explaining how customers can examine certificates?

Or any government websites?

Note I'm specifically asking about certificates, and not just "Look  
for the padlock" advice.