East Midlands Parkway I have commented on before, the three southbound daytime departures at 47, 50 and 56. The middle one is a stopper. The two trains to London St Pancras are the 47 and 56, to make matters worse the 47 is the intermediate Sheffield to London service which has made the intermediate stops and was a well-loaded (to put it mildly) Meridian, the 56 which follows it is only from Nottingham and was an HST, commonly more than half-empty. In fact the two trains are so close together here and at Leicester that the first scoops all the passengers just waiting for the London train who are not "in the know". The HST is booked into St Pancras just three minutes after the Meridian, in fact passengers from the former may still be trying to get through the barrier when the latter pulls up.
If you want to go from East Midlands Parkway to Loughborough the two departures per hour are the 47 and the 50, which may be the worst imbalance of all to be recorded here.