Anecdata:
My friend got symptoms about 36 hours after her work do last weekend. (Massive Christmas party hotel with three rooms containing several different companies each, all using the same bars and loos.)
It didn't occur to her that it was covid, but the GP told her to take a lateral flow on Tuesday when she asked for antibiotics.
It was positive, so she took a PCR on Wednesday (first available at walk-in/drive in locally )
She saw the result that she had tested positive when she woke up on Saturday morning.
Until she told me this saga I didn't fully appreciate the amount of time it can take from "got infected" to "appears in the figures"
And that is making me wonder what next week will bring.