A number of changes taking place at the end of June on Megabus:

M12
The amount of Saturday northbound journeys is cut from the current 3 journeys to just 2 - the overnight departure, and what is currently the 1500 from London which will run 2 hours earlier than now (leaving Sheffield Meadowhall at 1640) until Wolley Edge then from Leeds it runs an amazing 2 hours 15 minutes earlier, Middlesbrough arrival at 1845 (presently 2110). Sunday, the duplicate remains albeit duping a run that is 3 hours in front of it. Monday to Thursday there are now 4 northbound journeys with the addition of a 0800 from London (1140 at Meadowhall, 1215 from Leeds) - the mid afternoon 1500 departure departs from London at 1300 arriving in Sheffield at 1710.
Southbound the 0620 from Newcastle (Monday to Friday - 0640 on weekends) will run earlier as well (Middlesbrough departure time is now 0720 all week).

M12A
Withdrawn

M34/M35/M36 plus NEW M33
Recast Cross-Country timetables - some journeys being re-routed to serve Sheffield rather than Manchester.
Combined with M12/M20, there will be a 2 hourly Newcastle to Leeds service on Megabus.