Interesting, yes but Perth is on the cusp of doable non-stop from LHR but it's not going to carry your typical load of 250/300 passengers. Will always remain a one-stop option from wherever in Europe.
Islamabad and Singapore would be more worthy of discussion as both are current destinations with the former 4 or 5 weekly non-stop and the other daily 1-stop (SQ is effectively no different from EK!)