Once, in our early l/h days, we connected LHR-LGW and realised that [through my ignorance?] we had a 5+ hour wait for the next LGW-JER. But, wait! ... there a flight in just over an hour [schedule changes, I have no idea] showing on the boards!!
I went to the ticket desk, did the confused passenger sympathy bid, and we were re-ticketed in moments.
I will NEVER rely on that working again.