Heavylift Cargo is an Australian operation. They do a lot of work for RAMSI (Regional Aid Mission to the Solomon Islands) which is led by the Australian Goverment so I don't think there would be a problem with their operation or maintenance. It is probably too much hassle to register it in Oz being a unique type, little or no manufacturers backup which is why it is registered in the Philippines.
It is almost certainly being chartered by Bristows Australia returning a couple of G reg 332s back the the parent company. One of the replacements is a 225 that I believe is going on a long range contract in Broome.
They would'nt be able to return them to the UK direct. The old Belslow couldn't get over the Alps.