The pool comprises loans originated by Keystone Property Finance, a specialist BTL mortgage lender. Keystone was established in 2007 in partnership with Bradford & Bingley that provided funding. Keystone withdrew from the market in 2008 because of the financial crisis. Activity was relaunched in 2012 using funding provided by two other lenders, Aldermore and Paratus. Since September 2018, after the partnership with Paratus ceased, Keystone entered into a financial arrangement with UK Mortgages Ltd. and started lending on its own balance sheet. For this reason, limited performance data on Keystone's mortgage book exist. Although Keystone was involved in the issuance of preceding transactions in partnership with other lenders, Hops Hill No.1 will be its first securitization to be launched without