Rental Income: Unless nonresidents take specific steps, they will be taxed on net rental income sourced from the UK at a flat rate of 20%, which must be withheld by the tenant or letting agent. However, effective tax rates can be brought down to around 9% with all the allowable deductions.
Capital Gains: Capital gains are taxed are taxed at progressive rates, from 18% to 28%.
Inheritance: Estates or assets exceeding the current tax threshold of £325,000 (€433,333) are subject to inheritance tax at 40%. In calculating the amount of the estate, the value of any gifts made by the deceased within 7 years of death must be added (some small gifts are exempt).
Residents: UK residents are taxed on their worldwide income and on capital gains from disposal of their UK assets, and most likely on their overseas properties too.