http://track-chinapost.com/result_china.php?order_no=LZ121485554CN shows the parcel was received by China Post on Jun.2, and handed over to airlines on Jun.3, it is still waiting for the flight space to UK. Most international flights in China have been canceled due to the coronavirus outbreak. China Post does not have enough air space.
According to our statistics , the average wait time for a parcel to UK about 55 days, but some parcel did take 123days to arrive, suggest you wait patiently and watch for your buyer protection period and ask an extension if it is running out soon,or open dispute for a refund.