This is much harder to evade - if you own most of Mayfair, you can't just move your assets elsewhere - they are very clearly tied to the location.
Of course, this would mean taxing powerful aristocrats, including the royal family. With their large majority, the British government had the opportunity to do this, but decided to take an easier path. The reason why this path was easier is now becoming clear to them.
The UK needs to radically reduce its social safety net and simultaneously cut taxes, at least for new companies and small businesses. The only way out is real, sustained, long term growth and innovation. Stealing ever more of a shrinking pie is already running out of steam.
With the exception of certain pension benefits there isn't much money flowing into these programs to begin with.
The people who don't (currently) need them see them as a waste.