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Interesting post because it shows the difference in valuation between the US and UK. Even allowing for a bit of takeover speculation in the Redback price, BVC would be valued at around 50p now, if they had the same rating.
Can't help with the comparison though, I suspect this information is known only to industry insiders, I just haven't come across a table ranking similar products. I would guess that the industry doesn't want to risk this transparency, as it would hurt those lower on the list.