BT have deployed a new service that uses hiya, this works alongside the normal call protect features and block lists. Those flagged by Hiya as nuisance will pop up like that on the screen
https://www.bt.com/help/landline/all-about-bt-call-protect-for-digital-voice
Thanks for the link. hopefully Hiya will get it right & if not the caller can leave a voice mail & I can get back to them.
Regards,
T2A