I still don't understand the pb as wake turbulences are not remaining on the preceding aircraft's path... In fact, the only reason I see for WT to be on the GS would be that the preceding is actually flying above it... or that you land with a goof tailwind.
Regarding the BA 38, why not suggesting to raise up all GS to let's say 10 degrees, this would allow loads of fuel saving as we could shut down engines passing the IAF. Of course this would just be airmanship and smart interpretation of what can't be written in the SOPs... (I'm kidding BelArg..)