Another headline grabbing IC service would be the 07:40 Norwich - Liverpool Street and 17:00 return, the only Anglia InterCity services to run non-stop from Ipswich. Interestingly (to me anyway) there are no such non-stop services on the Great Western, although the First Great Western IEP timetable has regular non-stop runs from Paddington to Bristol Parkway, even off-peak. On EMT, the 07:55 Nottingham to London is the fastest train of the day from Nottingham to London, with a 1 hr 31 minute timing, but there is no corresponding Northbound working.
The below is way off topic but...
Avoided, sadly. Went some years ago, IIRC after a period with a Derby stop added.
For more background on the 'quirky' non-stop MML services: In the early 1980s, many London - Sheffield trains alternated between serving Nottingham or Derby, the Nottingham services being run primarily to serve the then relatively new InterCity parkway station at Alfreton. The time penalty for serving Nottingham was more significant than that to serve Derby, largely because of the reversal that was required. This and the fact that the majority of custom from Alfreton was to Nottingham anyway led BR to focus on running the St Pancras - Sheffield services via Derby, particularly after the HSTs were introduced. Provincial Sheffield - Nottingham (and later Liverpool - Norwich) services replaced them and connected into the InterCity services at Nottingham. The Sheffield - London services have been focussed on Derby ever since.
Since then, National Express MML operated a 1 hr 59 minutes timing from Sheffield to London (07:30 off Sheffield in 1999), non-stop from Chesterfield but this was rarely achieved. Nowadays the 07:29 Sheffield - London St Pancras completes the journey in 2 hr 4 mins making the omission of the Derby stop (which is lucrative in it's own right) virtually pointless.