These are first-class securities such as government stocks or local authority stocks.
Securities with interest and repayment guaranteed by the UK government. Often used as a synonym for high quality - the securities are known as gilts, the market is the gilt market.
Government bonds issued by the United Kingdom. Global Master Securities Lending Agreement (GMSLA): A market standard legal agreement drafted with a view to compliance with English law. An English law opinion has been obtained on the agreement