Clearly different councils will have adopted different processes and procedures where committees are concerned but was just going to add that an election doesn't necessarily change everything as the council as a corporate body exists regardless of who is a councillor. So, if your committee structure was in existence before the elections, it will continue unless changed. However, it would be usual for committee members to be elected by full council to that committee each year and certainly after an election and I'd expect the first item on the agenda for each committee would be to elect a committee chair unless that is set by full council.