LONDON–(BUSINESS WIRE)– Santander UK PLC Issue of GBP 1,000,000,000.00 Floating Rate Covered Bonds due September 2029 Series No 89 Tranche 1 MTN ISSUE NAME. Our Ref. MR5459 ISIN Code. XS2892385225 TOTAL INTEREST AMT. CURRENCY CODE. GBP DAY BASIS. ACTUAL/365 FIXED (A005) NUM OF DAYS. 94 INTEREST RATE. 4.2282 PCT VALUE DATE. 14/09/2026 INTEREST PERIOD. 12/06/2026 TO 14/09/2026 GBP 10,889,063.01 POOL FACTOR. N/A