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.

EMR have announced that the much-anticipated extension to the station car park is due to open on Sunday 15th December 2019.  This will provide an extra 200 spaces, bringing the total to 500.  The existing 300-space car park is regularly full by early morning, with excess cars parking in nearby residential roads, or on a non-railway 'overflow' car park that is well named as it regularly floods! 
​Work is also under way around the subway steps and the southern end of the southbound platform, so we hope that opens soon as well.