CONFORMED VERSION FOURTH SUPPLEMENTAL DEED TO THE AMENDED AND RESTATED SERVICING AGREEMENT DATED 4 OCTOBER 2007 24 APRIL 2018 SANTANDER UK PLCas Seller and Servicer andABBEY COVERED BONDS LLPas LLP andDEUTSCHE TRUSTEE COMPANY LIMITEDas Security Trustee

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