.... tell a lie, that Sasha set has the tune, but I found this Easygroove one with it, which will be the one you're after https://hearthis.at/mysticalc/ektos-at-hardings-easy-groove-16th-february-1991/
Ahhh I looked at other Ektos tracklists, but had a tab open with Sasha and hadnt pasted it into the file I was searching It;s the Sasha early 1991 at Ektos, Hardings Track is at the end, Solo - Rainbow
i saw it in a tracklist recently The only sets I've been going through are Ektos, Odyssey and Fantazia Summertime. Pretty sure it isnt in the latter one, as the tracklist is all available. I think the track has rain/rainbow in the title I just can't find it right now though