As long as the scheduled flights are catered for, that sounds much better than nothing at all.
I'm not fussed about divert cover, frankly, there is not much traffic over Manchester between 2300-0500 that would require MAN, so, the chances of diverts are slim anyway.
Like I say, my main concern was the 'scheduled' movements, as, I'm sure one of the LH8165 flights departs at 0450, the FedEx ATR departs between those hours too, and some the metroliners now try to use MAN in the dead of night whenever they can due to the nature of the flights.