The composition of the cover pool backing the covered bonds, which is made of U.K. prime residential loans. The unused notch of uplift, which means we would not automatically lower the ratings on the covered bonds if we lowered the ratings on Santander UK by one notch. The issuer's commitment to maintain a level of credit enhancement commensurate with the current rating, via the asset coverage test. The structure of the asset swap, which we don't give credit to in our cash flow analysis as it does not support the program's rating under our counterparty criteria. S&P Global Ratings' stable outlook on its ratings on the mortgage covered bonds issued by the Santander UK PLC Global Covered Bond Program reflects
