RE: Big sells - No share price change18 Oct 2013 11:17
dave I think you will find these are not sells at all but buys.
Although LSE is reporting the current spread as 21.5 / 22.0, I am getting a live price of 21.6 on the ask from Hargreaves Lansdown at the moment.
When the trade is reported on here, because the trade appears to have gone through closer to the bid than to the ask, LSE assumes it was a sell when in fact it was a buy.
As to why the ask is being reported as 22.0 rather than the 21.6, I must confess I am not 100% sure, but it is calculated based on what the MMs are reporting... many paranoid types would therefore tell you it's the MMs playing games / manipulating the trading pattern when things like this happen, but as far as I can tell this sort of thing doesn't seem to affect share price at all - just confuse private investors like us!
hope that helps...