picnicking and shipspotting

main is MSC Mia Summer 11 at anchor awaiting a berth
extra Boka Polaris at anchor offshore construction vessel arrived from Aberdeen
extra Queen Mary Cunard cruise ship arrived from Invergordon and  berthed at the container terminal
the puzzle is why the Queen is not berthed at the huge cruise ship pontoon nearby allowing in the container ship ? maybe a fault at the pontoon or its landing bridge...I blipped this Cunarder at the pontoon on the 1st of June
Greenock very busy with cruise ship passengers walking about in the sun and riding the open topped bus