It has had a lot of work done, some of it very far from standard to my eyes. There are even some tags missing from the board (around where the green ‘drop’ resistor should be). That doesn’t mean it isn’t a good deal and it is all fixable. There doesn’t seem to be any wax leakage around the mains transformer, and that is the first thing to look for in hot climates like Australia. I’d view it as a nice cosmetically clean looking restoration candidate with what look like some potentially valuable valves.
I’m sure once properly restored to factory spec it would love your LS5/9s.
PS I really don’t like the way that Bulgin mains connector has been wired-up without strain-relief! Always assume those things are lethal unless done with a proper well-fitted strain-relief sheaf.