I totally agree with what Elouise said, that happens all the time and really annoys me.
I never deliver before 9am or after 6pm (unless it suits me, which it rarely does) Never on a Sunday, unless its M day etc and then I charge an extra £4.50 and no one bats an eyelid at it, I never ever deliver on a bank holiday Monday.
If someone wanted a delivery at 8pm I'd say no unless it was a £100 order and I'd lose the order if I didn't.