I've just watched the Wednesday wtf episode, presumably introducing us to the new practice nurse as others have mooted.
I noticed in the credits Bharti Patel /Ruhma(she was the voice on the end of the phone ? Roberta, telling nurse to switch it off and on again)
Also Matthew who plays Daniel was credited as Max ( the voice on the phone who told nurse we can't prescribe the "expensive" heart medicine)
Blimey they can't even afford duff voice actors!
Barti/Ruhma was quite good actually