The iBoxx GBP Liquid Corporates Long Dated is designed to measure the performance of investment grade, GBP-denominated corporate bonds, with a minimum amount outstanding of GBP 250 million. Securities must have a remaining time to maturity of at least 1.5 years at rebalancing. Bonds must have a maximum age of 4 years for existing bonds and 3 years for new bonds, maximum permissible minimum lot size of GBP 100,000, maximum minimum increment of GBP 1,000 and minimum run of two years. The index maintains between 25 and 40 issuers, with a maximum weight of 4% per bond.