Didn't drive Route 9 last Thursday but this kind of thing has happened to me twice over the years on the B4632 coming back through the Cotswolds late at night. Both times I just suddenly "arrived" somewhere further along the road with no memory of the stretch in between. First time I put it down to tiredness but the second time I genuinely couldn't explain it, I wasn't even that tired and it was only about 9pm.
What time did it happen for you? And did you notice anything in the sky beforehand or was it just suddenly - gap - and you're further along the road? That's how mine felt both times, no lights or anything dramatic, just missing time.
Really keen to hear more details from anyone who was on that route. These kinds of accounts are so easy to dismiss but when it happens to you it feels completely different.