Hi, I'm pregnant and want to start properly self isolating once I get into the 3rd trimester. I thought I'd be organised and book a delivery slot for a few weeks' time but everywhere is booked up (unsurprisingly!) until 13/14 April. Just wondered if anyone knew if there was a specific time of day that new slots were released? Presumably slots on 15 April will be released at some point today/tomorrow...? Thanks