With all deference to his past influence on the scene, which was well before I became acquainted with Northern/Rare Soul or whatever, but I heard him 5/6 times when he returned.
First time was at the 100 Club. He played nothing very daring and it was pretty much a nostalgic walk and talk through the story of Northern Soul, bit like a former prime minister doing the lecture circuit. He played Unique Blend which was a big spin for Butch at the time and not yet as widely known as it went on to be. Ian claimed he'd played it at the Mecca. Who knows if he did or not - he could claim to have played anything there and, unless someone confirmed they'd heard it sometime, somenight, we'd be none the wiser. One thing we do know though is he couldn't claim to have played the Four Vandals there. To be fair, the floor at the 100 Club was packed that night, Adey had broken with 100 Club "tradition" and given Ian a 2 hour slot and the reception he received was rapturous.
Caught him 3 times at the Marrs Bar and thought his sets were pants - far too long (Ian insisted he had a 2 hour slot at all venues that booked him), far too much lecturing between records, no structure/coordination to the sets, no sensitivity to the type of records that had been making the grade since his first departure from the scene. The dancers simply melted away each time and the venue began to suffer as I'm sure the promoters will confirm having taken the risk of making Ian their resident DJ.
He was obviously a great Northern Soul DJ in his time, but second time around, in very different times and circumstances, he did the one thing a good DJ shouldn't do - ignored his (paying) audience, a lot of whom didn't know who he was from any other aspiring jock. I don't think he was hounded out by anybody. In fact, given the foregoing, he was given bucket loads of opportunities by all sorts of people. Fact was his DJ slots dried up because he couldn't work a dancefloor, promoters couldn't afford the risk of booking him and then his own venue failed for the same reasons.