It would be difficult to prove that there were records played at Cleggy and not Wigan, but there were some like Elusive, as suggested by Jamie (leave him alone Andy!!! ), Crow, Black Nasty, Willie J, Skullsnaps and my avatar that were readily accepted at Cleggy but had a very limited response at Wigan.
I reckon I've seen World Column on a Wigan compilation CD, which I think is a bit ironic really.
And before anybody asks, I did go to both places in 75/6 onwards......just preferred the more open-minded approach at Cleethorpes