If this is a suggestions thread, then may I suggest a new 2tpd weekdays and 1tpd return weekend service, one during the peak and one off peak between Hinckley / Nuneaton and London calling at Narborough, Market Harborough, Kettering, Wellingborough, Bedford and London St. Pancras.
For example the first train arrives in London by 0800, then an off peak service forms at around 1100 to go Hinckley, then a return service from Hinckley at around 1530 for the off peak market, and the evening peak service to leave London at 1830?
I reckon there would be a good market for this if the journey times and prices were made competitive? Hinckley and Narborough are both somewhat sizeable towns without a London service and it would add capacity and provide connectivity between local destinations in the East Midlands.
A 4-car or 5-car 222 would probably suffice for this.