That Wiley Fox new parent is running a production is good news but tempered by the fact that its highlighting MS support will stop shortly.
Being a hub for F1 is not the same as being a hub for scale manufacturing of consumer devices, I think it would be a struggle to get the pricing right if you use UK suppliers for anything other than prototypes
I would love to see MS make a decision to revive mobile but not until they've fixed their issues with mass market support
I'm fairly sure the Katy Perry video was a product placement during the launch - though I may be wrong.
The on-going use of Lumia in business is, sadly, more a reflection on resistance to change than genuine desire to maintain the brand, if it were otherwise there would be the same pressure to maintain support for W10M as there was/is for XP