At easyJet we have recently changed our 'stabilised approach criteria' to reflect the use of higher than 3° glideslopes. In the past it was only permitted to have <1000 fpm rod under all circumstances below 1000'. That has now changed and you can add 150fpm for each 0.5° extra on the glideslope. So at MRS where the glideslope is 4°, you can now accept anything less than 1300fpm as being 'stable'. Obviously you adjust the flare accordingly, but it has taken a lot of the pressure out of these types of approaches and seems a sensible tweak to the rules. I am a previous user of the 5.5° glideslope at LCY, and again as long as you have had the proper training and observed sectors, it is no problem if you follow the correct techniques.