Bletchleyite
Veteran Member
A fallow period in the middle of the day should enable recovery from the disasters of the morning peak to a promising start of the evening.
You jest, but LM did this "ad hoc" on a few occasions when things went very badly wrong, to allow units and crews to be moved back into the correct places for a decent evening peak. It did work and was worthwhile if a little inconvenient.
I wouldn't suggest leaving a daily 4 hour gap, but reductions in frequencies off peak (with peak services remaining as a higher frequency as peak extras for capacity) is a fairly solid idea for making things more punctual. If that was done, you could potentially follow the former LM approach of "always run everything in both peaks even if it runs very late, and just tidy it up during the reduced frequency/train length period in between".