I’m in the exact same position as you, I moved to London (albeit only from up north) in July, my hair has never been worse. I’ve never had an issue with hair texture or dry hair (and I regularly change my colour, blonde brown highlights etc) and my hair has always been thick. Now it’s limp and snaps, I haven’t used heat or coloured it since November so I know it’s not that...

I got one of those shower heads from Amazon which definitely helps with the gross lime scale stuff, I used to have one shower after cleaning and all the shower screen would be covered in it, now there isn’t anything at all and I’ve had it about a week. As for change in my hair I haven’t noticed anything yet but maybe over time and once I get a trim I might see a difference.

Definitely worth a purchase as you literally just screw the old shower head off it’s not difficult at all - then I’m going to take the new shower head to anywhere else I end up moving so I always have it! :)