Yes, I have done it before. Actually, the PCN was issued because the time displayed on my Blue Badge clock was incorrect. I parked at around 2:30pm, but the clock showed 5:00pm, which led to the ticket being issued — although this reason was not stated anywhere on the PCN itself.
My question is whether this can be contested, as the incorrect time was an honest mistake and not an attempt to mislead the inspector, especially since parking is free after 6:30pm.