An example of cabotage: LHR-BFS on EI
That comes under the EU Open Skies. I was referring to any flight ex-UK which then continued as a domestic route in another country, outside the EU - although I cannot think of one inside the EU either - i.e. international leg followed by domestic leg, not EI, FR, U2 etc operating bases all over the EU as Open Skies allows them.
Back in the 80s, wouldn't PER-SYD have been operated as a continuation from LHR having stopped at a couple of other places en route?
Sorry if we're veering slightly away from BHX here. I know we had the AI route operating BOM-BHX-YYZ, but that doesn't include a domestic sector. Again, think that used to operate a long the lines of YVR-YYZ-LHR-BOM?