The “foreign ownership levy” could raise up to £1bn
Overseas firms own 57.7% of shares, while UK pension funds own just 4.2%
Almost 13,000 have not declared beneficial owners, facing sales restrictions and fines
Nearly 200 properties are held offshore by royal families from Saudi Arabia, UAE and Qatar
More than 138,000 properties held overseas, higher than Land Registry figures
The foreign owners of UK property must be declared, or face fines and imprisonment