Thanks all.
The low volume trades are 'Iceberging', or breaking a order (in this case a buy order) down into smaller parts so as not to spook everyone. It has been going on for about 3 days now so goodness-knows how big the order is.
You'll notice the trades happen about every 1m10s to 1m20s apart and can vary from 1k, 1.5k, 2k and 2.5k. I think it's Credit Suisse or Fortis but will know for sure in the next couple of days when the data comes out.
It's happening over at CER as well.
I posted this link last week and it contains some more info on algorithmic trading:
http://en.wikipedia.org/wiki/Algorithmic_trading
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