Train drivers strike - tomorrow Dec 11

This strike will start at 3.00 apparently - and will last for 24 hours. Problem is - some sites refer to it as starting at 15.00 - and others as starting at 3.00. As I am depending on catching a train on Friday morning around 8pm, i need to know which of them it is, a 24 hour strike - from 3.00 Thursday or 15.00 Thursday??
thank you