reynoldsno1 ... as a matter of interest, I am (among other things) the Senior Procedure Designer for the CAA in Papua New Guinea. I am the one who implemented Pans Ops here, complete with the speed restrictions previously posted. My interest in what the UK CAA has done with speed limits is purely professional.
Your assumption is probably quite reasonable but I'd really like to know how they justified it in their AIP. I don't have a copy of the UK AIP or I'd have investigated it more directly.