Authorities cannot get in until an estimated Wednesday. Tomorrow, they will apply for a warrant from the court, as they did not get sufficient answers to questions previously asked. Now Facebook has moved tonight to go into the London offices. I wonder what they are doing.
Do you have a source for this? It sounds a bit hard to believe. If the police believe that evidence was/is at risk of being destroyed (as you are implying), they could get an emergency search warrant immediately, even outside normal court hours. In the U.S., there are magistrate (warrant) judges on call overnight for exactly this type of situation; I imagine a similar system exists in the UK.
Yes, I seen the lady in charge of the regulator (not police) on Channel 4 news (here in UK), stating that she will likely be in on Wed and they cant walk in right now.