It doesn't really matter under which country we list them as long as we list them all the same. Before rearranging they were here as European, UK, Australian and US and under diffrent label names. I think the company in this case is a UK one, they have MCPS as rights company, the barcode starts with 50, so a listing under UK is fine with me.
All of these Tring International and Double Play CDS would have been released in Australia. Released may not be the right word as these products were more available than released in a traditional sense and I'm not sure if they would appear in traditional catalogues or appear in charts of the time. I used to (maybe still do) have some of these CDs and the other site lists this company (both labels are from the same company) as a European budget label. I don't think we can apply the independent (a la Rough Trade, Ace, Domino, Creation) tag to these products. The parent company has international in its name and that should be enough of a clue as to the intended markets for these budget products. These CDs generally surfaced in in what you might term High Street clearance warehouses in Australia and not generally in music shops. Sanity and JB Hi Fi (Australian music chain stores) did stock some but in the main they were warehouse fodder and sold for about $5 Australian. That's about nothing in Euro or US money!
However, this does raise questions about how we should list these labels because they certainly aren't what I'd call an independent label and the company would be probably better described as low budget global warehouse marketeers. What to do with these types of labels and the current slew of bootleg radio broadcast labels from all over the world is a bit of a conundrum for CD Albums world. Not that we're short of those.