BT have a service called, I think, call guardian which requires callers to speak and identify themselves by name eg 'Simon from Citizens Advice'. It then presumably forwards the call to the recipient who hears the recorded name when they pick up and has option to accept/reject.
I think they also have free service that filters calls from known spammers and spoof numbers (I get them from what look like a London number but are actually a digit too long)
Barring all withheld numbers can mean missing stuff that matters. Some of our phones at work withhold because we need new inquiries to come through a 'gateway' number and not that of the last adviser they spoke to.
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