Assuming the Bradford conflict can be resolved, What's the 0650 unit going to do for the rest of the day? It'd be hard pressed to get more than one round trip in so with a 1100-1200 departure from Glasgow it'll be back in Leeds somewhere around 1400-1500.
It could probably fit in another trip to Glasgow, but that would create an unbalanced diagram, so to balance that we might as well add another diagram, so 2 units are based in Yorkshire overnight and 2 in Glasgow.
Just incrementing the times from the earlier suggestion (so no chance it'll actually work, but this is crayonland) that would give Leeds departures at 0650, 0850, 1050, 1250, 1550 and 1750, with Glasgow departures at 0625, 0825, 1125, 1320, 1520 and 1755. Which would be a service that might actually be useable.