Worcester Shrub Hill to Worcester Tunnel Jn is absolute block, Tunnel Jn to Droitwich is absolute block. Droitwich to Stoke Works is timed as absolute block even if it is TCB. Because of all this it is the running times of the trains that cause the problems. It may take a passenger train 6 minutes to get from Tunnel Jn to Droitwich but you cannot send another train down until two minutes after its arrival (based on the tail lamp camera, it would be worse without it), so it is 8 minutes before another train can come from Tunnel Jn. Freight is around 9 minutes to clear the section so its 11 before you can send another. That doesn't leave you 10 paths an hour. The same applies for Droitwich to Stoke Works but without the 2 minute allowance for signaller duties for AB.
So simple back of a fag packet planning with a standard freight train per hour towards Stoke Works, which is what a FOC would expect, then from Worcester Tunnel Jn to Droitwich you could have xx.00 p, xx.08 f, xx.19 p, xx.27 p, xx.35 p, xx.43 p, xx.51 p, which is 7tph ignoring anything else such as conflicts at Droitwich and anything for robustness.
If we are generous and add a second freight (eg: one for Round Oak, another for Kings Norton) you could assume xx.00 p, xx.08 f, xx.19 p, xx.27 p, xx.35 f, xx.46 p, you would then struggle as an xx.54 wouldn't allow a standard hourly pattern. That gives you 6tph only 4 of which are passenger.
The "innovation" could well just be adding an IB like there is on the up or some line speed improvements, but again none of the above is detailed and takes account of what happens around it.