WRT Fosters there's a story there.
I remember the Fosters up to the 1980s - excellent hop and malt, more "premium" than a lot of the beers on tap and a wee bit upmarket. Then when Elders IXL not only bought CUB but also the UK Courage beer and pub empire, there was an opportunity to cash in on the big lager market in the UK so they started brewing Fosters over there and heavily promoted it until nowadays it's the second biggest selling lager, after Carling. However IIRC the only stipulation was that they used Fosters B strain lager yeast. Apart from that it's open slather and I guess it's just made with UK lager malts, probably corn instead of cane sugar and some sort of hop extract. And it's only 4% ABV.
In Australia, Fosters was put on tap to try and break into Lion territory and failed miserably. After that it became an orphan brand and lost all its hop and malt character which was a tragedy.
As a refreshing pub pint the 4% UK version is unremarkable - had a few pints in Yorkshire last time I was there. G4WAY: if you want to try a really gruesome experience, suffer your way through a six pack of 4% "Fosters Classic" that I believe is brewed to appeal to pommie ex pats. As for "classic" that's another one that should be referred to the rorts commission, Fosters has never been 4% here.