Pre-market trading at 2pm?

Hi, a few weeks ago we got a new notification that trading would open at 2pm instead of 2.30pm. Does this also work on isa/invest accounts? What does it mean exactly? I can’t find the original notification. Thanks.

This applies only to OTC instruments. We have extended the market hours for those instruments since we have noticed that IB routs orders for execution outside of the time frame that we offered previously.