It sets up a likely scenario where protestors show up to to the previously scheduled time so the police can claim it is an unlawful assembly and try to disperse the whole protest.
The Met Police are attempting to delay the start time by one hour and 45 minutes to 2:30pm, despite the fact that the usual assembly time of 12pm for a 12:45pm start has been advertised for several weeks. No explanation has been given for these moves, announced to organisers at 4pm on Friday 30th August, after the police themselves cancelled a meeting to discuss the demo on Thursday morning.
It sets up a likely scenario where protestors show up to to the previously scheduled time so the police can claim it is an unlawful assembly and try to disperse the whole protest.