Have you been affected by Thameslink timetable changes?

Passenger groups and unions have been critical of changes they say could mean working lives are severely impacted
Commuters across England face altered or reduced services as part of the biggest change to timetables in living memory, set to cause disruption beginning Sunday.Why is this rail timetable change significant?
New timetables are published every year but normally with minor tweaks. This year Govia Thameslink Railway, which carries about 500,000 passengers daily, has redrawn its schedule