Pillbox 029, Tai Tam Bay near American Club [1939- ]
More details & photos of how it looks today here.
The only mention of the pillbox in Tony Banham's 'Not the slightest chance' is for 10am on 19th December 1941:
B Company Middlesex is ordered to retire to Stanley. The order is initially disbelieved, and then confirmed. PBs 21, 22, 29, and 30 are ordered to evacuate. A fresh HQ is established near PB 24 at Stanley, and the crews of 21 and 22 under Second Lieutenant King, are put into positions astride No 1 Bungalow. The crews of 29 and 30 are put in temporary positions near the new HQ, and the crew of 23 moves back to a position on the beach.