I suppose that means not much of a delay really, especially compared to roll out of other fleets.
The most worrying some might think of is if demand post Covid has changed enough to mean EMR (under DfTs guidance / control) are re-visiting the requirement. But it is doubtful as they are an integral part of the electrification of the Midland Main Line (
see here) that is progressing quite well.
I the 810s are close behind the 805s & 807s in the delivery/implimentation queue and so will be imminent. Have a look at progress with the Avanti
805s & 807 here.