It seems very hit and miss as to whether Plusnet line rental customers get a Phone Book. I suspect it's regional, some places blanket "Phone Booking", some checking entitlement. Or perhaps it's just a case of some people being opted out (whether requested or not).
Would be good to get staff input on this. Failing that, I'll suggest they raise a ticket. But the link suggesting Phone Book entitlement for WLR customers is certainly helpful.
Oliver.