CT UK High Income Trust PLC is a closed-end investment company that primarily invests in UK equities and equity-related securities. Its business model focuses on providing income and capital returns to shareholders through dividends and capital repayments. The company operates by delegating portfolio management and other services to Columbia Threadneedle Investment Business Limited, which is responsible for asset management, stock selection, and risk management. CT UK High Income Trust serves investors seeking long-term growth in capital and income, leveraging its structure to maintain investments during market volatility.