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@craigmaloney @sil I've got the Panasonic KX-TGC223E DECT set with 3 handsets (The '3' in the model' is the pack size). The base station has a button for play for the answering machine. It says it has Nuisance Call block - I don't know if that's a general 'unknown' set though. See: https://www.panasonic.com/uk/consumer/home-phones/telephones-with-answering-machine/telephones-with-triple-handsets/kx-tgc223e.html

I'd say it's OK, but the audio quality isn't great. I believe BT also do their own brand DECT sets, don't know if they're any different.
My mum manages to use it fine.