Let’s not kid ourselves here. That’s not the reason.
I think it probably is. If you live in Liverpool and think that Kensington and Chelsea is a suburb of London a bit like Toxteth or Everton. Then you’d be forgiven for wondering why London Boroughs get more news time than entire cities, it’s because they are individually bigger than entire cities (or at least very large towns).
In fact come to think about it, London does flood fairly regularly (often enough that the ground floor of my old office wasn’t insured against flood risk). And as this thread shows, the rest of the country didn’t infact hear about it.
The reason is that the UK power base is in London. The prioritise their own needs and wants above everything else. They don’t care about the needs of the northern 80% of the country.
Simples
You say that, but “They” isn’t some Illuminati style lizzard overlords controlling the news and politics. Boris doesn’t phone up the BBC and tell them how many minutes to devote to flooding in Huddersfield.
I think there is a problem of perception though. The news had someone who’s house flooded ranting about how no one cared or was helping because they weren’t important. Missing the irony that a camera was filming them and it’s not like Michel Gove personally delivers the sandbags to Embankment or carries the wet sofas out of basement flats in Hammersmith.
The rhetoric of “you’ve been ignored” may have a basis in the truth, but it’s also been hyped up enough to give us Brexit! And the rhetoric only flows one way, the population south of Watford haven’t spent the past week thinking of ways to ignore the flooding., in the same way the population of Huddersfield probably haven’t spent the past week worry about how businesses paying the surcharge for crossrail are going to cope with the cost and schedule overuns.