Brendan -
Yes, that about sums it up. A Brown-flanked Bush Warbler was heard in song on Tai Mo Shan in April 1999. Breeding was proved in 2003 and up to 6 were singing in 2004. There were 12 singing in 2006 and I also had 12 in song in 2009. 28 may well be a record count for Tai Mo Shan - although there may be a higher count than that in the past 2-3 years from the Pat Sin Leng range.
David