Yes I agree it is much inferior to the vocal version and much shorter in length-I was working at Selecta Disc in Nottingham when we asked Kama Sutra to repress 500 copies of the vocal version for us-as it was deleted at the time.When they camein they were identical to the vocal-but I happened to play one before we started selling them.We were really peed off cause they had pressed the instrumental by mistake-so we sent the stock back and they then rushed out the vocal which didn't do anything for them sales wise.To be fair there may have been one or three that didn't get returned!Alan Day was working with us at the time and he may still have one>and obviously I don't know what they did with the 496 returned copies!!!!
