(double what you get in LHR)
I know, but you cannot compare EGLL and OMAA (for many reasons...). The criteria for 2,5 NMs spacing on final is not that simple, the whole airport layout, weather conditions etc must be taken into account. At OMAA we have minimum 5 NMs spacing (perhaps in the future will be able to reduce this to 3 NMs when we move to the new control tower)