Early 90's, I blagged a jump seat on the Sultans airline flying into HKG from a Det in Bandar, sat immediately behind (fleet) Capt. Popped out of low cloud into lots of lower cloud over the harbour. FO calls we have lost the IGS, Capt looks out to his left and says he has 'the ground'. We are now feet dry descending towards the checkerboard and that mountain beyond. Two more FO calls re the lack of IGS, Capt says the same, I stare at FO and really start shaking my head (naughty?), HKG has disappeared and we are still going downwards. FO leans toward Capt, slams his hand down above the auto-pilot and shouts (and he did shout!) 'Captain,you will go-around now!'. TOGA,and the two RB's start to whine again and up we go somewhere over Kowloon. Min chatter all the way around the block, better Wx, argument starts as soon as we are off the runway, drift past our holding point. An interesting 30 mins or so.