The United Kingdom Debt Management Office. It’s an executive agency responsible for managing the government’s debt and cash needs, primarily through issuing gilts and Treasury bills.
Gilts where the dividends and principal repayments are related to movements in the Retail Prices Index (RPI). This is as opposed to a conventional gilt, where the dividends and principal repayments are fixed in nominal terms.
A return calculated over the time period invested, that excludes extraneous elements, such as deposits to and withdrawals from the investment accounted.