I was looking up flights from LHR - EWR at end of March and CO.com seenms to have changed the schedule with a fourth flight and also now a late flight leaving 6.30 or 7.30. Are these changes real?

CO29 is listed as leaving LHR at 10.25 and CO113 at 10.50. What would be the reason to have two planes depart almost at same time? Is there need for extra capacity at 10 to 11 am? Would it not make more sense for the 752, which I presume spends the night at LHR, to leave at 8 to 9 am?

Sorry if been discussed before as missed stuff on the forum a bit as very busy.