No, not a member of the peerage; rather, the LMS Princess Coronation class locomotive of that name, no. 6233, built in 1938.  She is now preserved in main-line operating condition and is a regular performer on railtours, such as between Ealing and York via Kettering and the famous Harringworth viaduct.  However, on Saturday 21st December 2019, she became the first steam locomotive to travel through the realigned track and platforms at Market Harborough, passing through on time at 12:39.  She was on her way from her base at Southall, West London, to the Midland Railway Centre at Butterley, Derbyshire, hauling only her two support coaches.  Nonetheless, she made a fine sight as she passed through at speed, exchanging greetings with the HST - another main-line classic - that was forming the slightly delayed 12:26 to St Pancras on the opposite platform.    (Photo: Bill Jones)

The new timetable came into operation on Sunday 15th December.  There is hardly any change for our train service at Market Harborough.  (Unlike some areas, such as Great Western, which sees major overhauls following further electrification work, for example.)
For us, there is only one significant alteration; the 18:34 from St Pancras on weekdays gains a Market Harborough stop (at 19:40).  This plugs a previous 42-minute gap in the evening peak timetable; something we in Harborough Rail Users have wanted resolved for some time.   As this train also calls at Kettering, this also addresses the very long previous gap in the evening peak service from there to Market Harborough.  We lose our stop on the 19:01 from St Pancras, but the next following train for Market Harborough is at 19:04, three minutes later!   Other than that, apart from minor re-timings by the odd minute here or there, there are no changes.

The extended car park at Market Harborough station opened today, 15th December 2019, the same day as the new timetable came into operation.  The car park extension adds 200 spaces to the 300 already in place, which were regularly full by early morning.   It will be interesting to see how quickly the 500 spaces fill up!
See also https://www.railbusinessdaily.com/new-bigger-car-park-opens-at-market-harborough-station/
Unfortunately, the full length of (southbound) platform 2 is not yet in use, as work continues around the subway and steps.  We are hoping that will be completed soon.