Bt have introduced a free call blocking service for landlines, this explains all.
www.moneysavingexpert.com/news/phones/2017/01/bt-home-phone-customer-you-can-now-opt-in-to-its-free-spam-calls-filter-to-escape-nuisance-callers
home.bt.com/tech-gadgets/tech-news/bt-call-protect-free-service-crackdown-nuisance-calls-11364136279348
Perhaps this is why the number of nuisance calls on my landline have reduced recently, automatically blocked. Nice one BT, thanks.
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