'en-GB-Wavenet-C' doesn't work [Google Cloud Text to Speech]

Question

I'm a beginner in coding. I am using the Google Cloud Text to Speech API for Python on a small program I'm using. The function is working and I get the synthesized voice results, but the MP3 file is different from what I need. I chose 'en-GB-Wavenet-C'(British accent female voice) as language_code, but the MP3 file sounds American accent male voice.

I visited Cloud Text to Speech API website(https://cloud.google.com/text-to-speech/) and tried "Speak it" demo. I tried 'en-GB-Wavenet-C' and it sounded British accent female voice.

I would like to know the appropriate code so that I get 'en-GB-Wavenet-C' voice result.

I use Debian 9.3 from Windows Subsystem for Linux.

I use Google Cloud SDK 210.0.0.

Thank you in advance.

Sincerely, Kazu

This is my code:

#!/usr/bin/env python

from google.cloud import texttospeech
client = texttospeech.TextToSpeechClient()

with open('resources/hello.ssml', 'r') as f:
    ssml = f.read()
    input_text = texttospeech.types.SynthesisInput(ssml=ssml)

# Note: the voice can also be specified by name.
# Names of voices can be retrieved with client.list_voices().
voice = texttospeech.types.VoiceSelectionParams(language_code='en-GB-Wavenet-C')

audio_config = texttospeech.types.AudioConfig(
    audio_encoding=texttospeech.enums.AudioEncoding.MP3)

response = client.synthesize_speech(input_text, voice, audio_config)

# The response's audio_content is binary.
with open('output.mp3', 'wb') as out:
    out.write(response.audio_content)
    print('Audio content written to file "output.mp3"')
# [END tts_synthesize_ssml_file]

Answer 1

 voice = texttospeech.types.VoiceSelectionParams(language_code='en-GB-Wavenet-C')

Should be

 voice = texttospeech.types.VoiceSelectionParams(language_code='en-GB', name="en-GB-Wavenet-C")