You could be sitting on a small fortune.....Much like my first ever piece of black vinyl also purchased in Woolworths, this being Pink Floyd's 'Relics' which I still own....
I really am going to have to sort through and market some of my collection.......
I really do wonder about some people that will buy vinyl that has previously been used for this sort of money, however I suppose if it was still sealed the inner liner would have completely disintegrated by now and trashed the vinyl anyway.
Meanwhile I am off to see if it ever came out on SACD....
I have a load of vinyl myself and some first pressings of some of the black sabbath albums which I might sell on eBay but still thinking about it as I have had them most of my life .