I don't think the Met Office warning about severe weather (with a side order of 'look - climate change!') counts as hysteria. It's their job.
The media will do what the media does. Pictures of sunbathers alongside headlines about 40C temperatures seem to be giving way to articles explaining how to avoid heatstroke, which is an improvement.
Anyone familiar with BRITISH infrastructure will know that relying on trains next week is foolish. I expect there will also be chaos on certain roads, as even if the tarmac can cope, a proportion of vehicles won't, and you only need a couple of overheated cars to cause a traffic jam. I expect we'll see localised disruption where electronics has insufficient cooling - businesses being unable to process payments because their server has shut down, sort of thing - not unusual, other than it happening in lots of places at the same time.
The NHS of course was struggling already. It isn't really news, but it won't take many sick old people and drowning victims to push things further past breaking point.