now we know who owns all the stock., page-6

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>For example who are Prospect Custodian Ltd, who do they represent, are they >associated with any other substantial in any way etc.
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I did a bit of googling, and Prospect Custodian Ltd is probably "Prospect Custodian Trustees Ltd" a trade union fund in London, so wouldn't be associated with any other holder...

Interesting analysis of the numbers, although I think it's hard to know if anyone has actually reduced their holding since some of their holdings may have just dropped off the top 20 for the other reasons you've mentioned.