1. Sri and Gopi Hinduja
Net worth: £16.2 billion 

Age: 81, 77

2. Len Blavatnik
Net Worth: £15.982 billion

Age: 59

3. David and Simon Reuben
Net worth: £14 billion 

Ages: 78, 76

4. Lakshmi Mittal
Net worth: £13.229 billion

Age: 66

5. Alisher Usmanov
Net worth: £11.791 billion 

Age: 63

5. Ernesto and Kirsty Bertarelli
Net worth: £11.5 billion

Ages: 51, 45

7. Guy, George and Galen Jr Weston and family
Net worth: £10.5 billion

Ages: 76, 56, 53

8. Kirsten and Jorn Rausing
Net worth: £9.66 billion

Ages: 64, 57

9. The Duke of Westminster and the Grosvenor family
Net worth: £9.52 billion

Age: 26

10. Charlene de Carvalho-Heineken and Michel de Carvalho
Net worth: £9.3 billion 

Age: 62, 72