It's mirrored in how tech firms are valued.
In the valley, you can have a so-so idea, land a huge investment, sell the product to other businesses for crazy money, and pay staff high wages.
In the UK, technology is this weird nerdy flash in the pan that "serious businesspeople" want nothing to do with, and investment and customers who value tech are in similarly short supply.
I write this as the employer of 50 people who'd love to pay everyone more but can't because our end customers undervalue our product, and investors are non-existent.
We saw this first hand when one of our clients sold our "worthless technology" for over $100m - yet in the UK £10k was the best valuation we could find at the time.
I sit in meetings with prospective customers who honest to God think that this system they'll be using to drive their entire £50m business through should be free because "it's just software". Simultaneously they'll happily pay a lawyer £200k to argue about the contract they're going to spend £20k with you through, because lawyers are real actual people, and we nerds are just soulless computer child-people. SEO agencies need paying well too because they have a marketing background, and marketing is also real.
Tech is seen as a utility like water over here. The people who provide it are viewed like sewer technicians.
So - it's not that employers are stingier, it's rather more that there's a lot less money in the ecosystem.
Finally, you're comparing to Google, who are a company who think nothing of putting a liberal arts grad with no experience on $600k to lead the spin fight against taxation in the UK - they pay crazy money, particularly to well connected people.
Oh, and fwiw, I'm cto/co-founder and I earn considerably less than you, so count your blessings.
I might have a small chip on my shoulder regarding this.