The event was Hardcore Heaven - 'Space' Feb 1999....they sectionned a bit of the sanctuary off for a room for an mark eg and mzone b2b 8 hrs marathon.

They released a 2 pack cassette pack which I did have then I lost it. 2 x 1.5 hr tapes. The pack was excellent believe me.

Very hard to get hold of as I dont know anyone else that had it. I bought the last copy in my local record shop.

maybe worth getting in contact with dj seduction and asking him (used to run the hardcore heaven events until 1999)