Broadcasts on O2 - UK under eNB 102988 using B1 10MHz and B20 10MHz signals.
5G n78 is also available from this site on Vodafone on a 50MHz carrier of 628032 (PCIs 5, 4 and 2 afaik). n1 DSS is also available on NRARFCN 428190 (PCI 732 spotted so far). O2 supports 5G ENDC on this mast as well (usually from 103971/104118).
Site Vodafone owned pre-Cornerstone, O2 was on a mast opposite but was demolished sometime around 2015.