10.53am: Another trader describes the finer details of what's going on: Advertisement: Story continues below
Currently the market has gone into what is officially termed an ''enquire'' mode, which means there is no trade at all.
Once the tech problems have been resolved the market will then go into a ''pre noticed received'' phase, or what brokers call a ''pre-auction'' phase for about 10 minutes.
That gives traders (etc) the chance to sort out orders after which trading will start.