Curated UK Billionaires List

I'm seeking a comprehensive, curated, and verified list of all UK billionaires. This list should include:

- Direct email contact details where available
- Focus on private or discreet ultra-high-net-worth individuals
- Exclude globally recognized figures (e.g., Musk, Gates)

Additionally, I want a broader list of low-profile billionaires across Europe and North America, ideally:

- Private business owners
- Industrialists
- Financiers
- Family-office principals

Verification should be done through official company websites and professional networking sites.

Ideal skills and experience:
- Strong research abilities
- Access to reliable databases
- Familiarity with professional networking platforms like LinkedIn
- Prior experience in data gathering for high-net-worth individuals