To be honest, I never thought I'd find this, but I did. Although, I have no idea what this hill is called, what the mast on this bit of concrete is or what the building in between the concrete area and Cornwall Street is. Answers on a postcard, to the usual address...
Unfortunately, Street View hasn't made it up the side of this hill, but there's a Picasa image which matches up with the shot in the film, showing the Shek Kip Mei Estate (thanks to Thomas for the pic and Roger for the correction).
