Hi,
I too have never heard of or seen this disk. I suspect it was a UK special. In the UK there seemed to be a never ending variation of different Amiga 'packs', which we never got in Oz...
I bought my own A500 a few years after my parents bought me a Commodore 64 'Family Pack' for Christmas - that was a great Chrisy! The C64 cost a princely $AU499 back in 1984 - which is equivalent to around $AU1200 in today's wonga!
Ah the memories!
I'd also love to get my mits on an ADF of this demo disk, if only to see how it compared to the 'Introduction' to basic (Part 1) demos on the C64!
Cheers,
Mike.