Agree with Geoff regards the CAT A speed restrictions ... but ... I found that if you can shoot the approach faster then the ATC, especially at Sydney and Canberra really appreciate it. Have shot them at 170 in the Seahawk and found that as long as you're slowing down by about 2 to 3 miles on finals, then the maintenance of the glideslope is pretty easy. Not advocating busting the rules at all but I find the CAT A limitations these days a little frustrating....worked well in the days of Hueys though.
Have found that at the higher speeds, Nick's technique provides more accurate glideslope control. Maybe it's a Sikorsky thing.