Nope only button above the graph is "change" and the doesn't have interleaving anywhere if I click it. The other buttons are there below with Kill LNS, Kill BT (Oh I wish) etc but nowt about itnerleaving.
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Just seen Shauns post above i'm on 20cn it's not on the control panel for 20cn lines, nevermind Shauns offered to get it switched off, what service and on a sunday too....