In accordance with the Written Scheme of Investigation (MOLA 2017b) a watching brief was carried out on the site between May- June 2018 for phase one and April- May 2019 for phase two. Natural alluvial deposits, also noted in previous archaeological evaluation works on site, were revealed in the central/ western area of the site. Above the alluvial was recorded a thin layer of organic peat deposit or dump of organic rich material and possibly, as well as the alluvial, related to the Tyburn River known to have flown in the area of the site in the past. Above the natural deposits the demolition and excavation works revealed few structural remains of an 18th and 19th century origin. A small red brick culvert orientated east-west was recorded in the north-eastern area of the site. The culvert was recorded to extent for about 3m and had a diameter of 0.75m. North of the culvert and along the north-eastern limits of the site was observed a partially demolished red brick wall that survived to approximately 1.2m in height. Another brick lined silted culvert/drain with a diameter of about 0.60m was seen in section in the central area of the site. These remains are surviving parts of the previous buildings occupying the site and relate to the urban development of the area in the high post-medieval period. Sealing the archaeological remains was a thick layer of demolition (brick) rubble accumulated by the dumping of different materials for levelling of the ground prior to re- building and redevelopment of the area in the past. The watching brief established the high extend of modern disturbance on site due to the depth and extension of the previous building's basements and foundations.