The answer is that BAC asked Airservices if it would be possible to do the 14/32 PAPI installation during daylight hours. This is to save dollars as it is cheaper to have workman during business hours rather than the overtime that has to be paid at night.
Funnily enough, some genius previously from the NOC and now in Bris Vegas says yes, having looked at all his computer programmes that goes "bing", and determines there will be minimum delays.
Then what do you know, but delays are now happening, up to 20 minutes this week, and no one saw it coming.
As an aside, 600+ movements a day are becoming the norm at Brisbane.
The good news is that they are way ahead of schedule, the bad news is that it will still be a few more weeks.
Also, 14/32 will be closed for 12-18 months when construction eventually starts on the parallel, but after that willl be back in service.