Not registered with companies House, found address on their website as Aldgate Towers London E1 8FA. Surprise surprise the company is not shown at that address. It's easy to get a mail drop box.
As the saying goes "wouldn't touch it with a barge pole" IMO.
Yes Balders found them both Shein Group companies are dissolved as far as I can tell so ignored them, will try and find where I got Aldgate Towers address from.
Balders and anyone interested you'll find director Yangtian XU, who was associated with Shien now has active UK company namely Zoe Top Business Co operating from a unit in Eastleigh.