Unable to download XML: HTTP Error 404: Not Found (caused by HTTPError())

[pcchu3]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.09.28
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

$ youtube-dl --version
2019.09.28

$ youtube-dl https://www.bbc.co.uk/iplayer/episode/m0007znv/ad/china-a-new-world-order-series-1-episode-1
[bbc.co.uk] m0007znv: Downloading video page
[bbc.co.uk] m0007znv: Downloading playlist JSON
[bbc.co.uk] m0007znv: Downloading legacy playlist XML
ERROR: Unable to download XML: HTTP Error 404: Not Found (caused by HTTPError()); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

$ youtube-dl --verbose https://www.bbc.co.uk/iplayer/episode/m0007znv/ad/china-a-new-world-order-series-1-episode-1
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'https://www.bbc.co.uk/iplayer/episode/m0007znv/ad/china-a-new-world-order-series-1-episode-1']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.09.28
[debug] Python version 2.7.15+ (CPython) - Linux-4.15.0-65-generic-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6, phantomjs 11000, rtmpdump 2.4
[debug] Proxy map: {}
[bbc.co.uk] m0007znv: Downloading video page
[bbc.co.uk] m0007znv: Downloading playlist JSON
[bbc.co.uk] m0007znv: Downloading legacy playlist XML
ERROR: Unable to download XML: HTTP Error 404: Not Found (caused by HTTPError()); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
  File "/usr/local/bin/yt-dl/youtube_dl/extractor/common.py", line 627, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/local/bin/yt-dl/youtube_dl/YoutubeDL.py", line 2237, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python2.7/urllib2.py", line 435, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 548, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 473, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 407, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 556, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)

Description

WRITE DESCRIPTION HERE
Video in the link above played without any problem inside Firefox. Downloading other programs from the same website was OK earlier today. But it stopped working this afternoon.

Thank you for investigating.

[pcchu3]

[Update]

This problem only seemed to affect programs that are the "Audio Described" version. Non audio described program of the same series was not affected. This one is OK:
youtube-dl https://www.bbc.co.uk/iplayer/episode/m0008cc7/china-a-new-world-order-series-1-episode-3