It absolutely still is, individually FIG (foreign earned income and gains) has replaced non-dom status. Some of the world's biggest ecom and fintech companies are domiciled in the UK as LTD companies and they pay ZERO taxes by paying management fees to owned companies in other tax-friendly jurisdictions. London is still the most powerful city in the world. It is the center of finance for not just Europe, but the world. There are many extremely talented and wealthy individuals in London in a myriad of industries from finance to technology. Capital availability for businesses is only rivaled by NYC and SF.
As for London, I︀ am not sure where you are from or where you walked, but central and west︁ London are bar none some of the most elite places in the world with virtually︂ no equivalent. The architecture, private clubs, sophistication and refinement of people you see just walking,︃ not to mention the sheer concentration of wealth, and consumer comforts (farm to home delivery︄ services delivering the best grass fed pasture raised beef and organic vegtables being one of︅ those) is unrivaled. You can also live in London tax free for 4 years now︆ with FIG and remit that money to the UK without any taxes. 4 years is︇ enough time to plan for the future or monitor for further progressive changes which are︈ highly likely.