If i could just through in my 2p worth i think the line ....
"Finally, not all share trades are published and some large trades can be delayed by upto 3 days. So today's TGP movement could have been due to a larger sale of shares, which will only become apparent later in the week".
Is more often the case, remember the MM's have a huge advantage in knowing what future sales are likly to be because orders are often placed a while before they are filled (which is basically what VS said) The poor old PI can only second guess whats going on. This is often the basis for ramping and de-ramping on these threads IMO....