[DTV]

The thing is, this isn't a hypothetical - GEs and LEs have been conducted on the same day six times in the past 50 years, including every GE from 1997 to 2015. Parliamentary seats get counted first, then local council seats. The media report the general election results, with the council results an afterthought only - particularly on the Thursday and Friday. Fundamentally, the only interest the national media really has in local elections is what they can tell you about the national political picture (even if they are an imperfect guide) - when national elections are going on alongside them, locals are superfluous. The most they get is a page tucked away on the BBC News website.