VLC for Android / documented 3.X controls · Version-scoped publisher documentation; no UK IPTV account/device test. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Choose a reliable reference
Begin with an authorised clip containing a distinct visible event and its sound, such as a clearly seen hand clap. Avoid making the first judgement from a distant scene where natural sound travel could confuse the comparison. Record whether sound is early or late and whether the same offset remains later in the clip. A growing drift is different from one fixed delay.
Use the documented audio control
VideoLAN’s VLC for Android 3.X player documentation places Audio delay in the audio-and-subtitle options. It describes buttons that move the delay in 50-millisecond steps and a RESET control. Its interactive method uses SOUND HEARD and SOUND SPOTTED in the order the viewer experiences the event. This is the audio control, not the separate subtitle-delay control; adjusting both without a reason can obscure which timeline was wrong.
Make a small controlled adjustment
If the early/late direction is uncertain, return to the baseline and make one deliberate change while replaying the same event. The documentation explains resetting and reversing the observation order if the first measurement is unsuitable. Keep system sound processing and external-speaker changes fixed during this comparison. An offset selected for one sample or output route should not automatically become the default for every video.
Verify before retaining the setting
Check a later event to see whether the fixed adjustment still fits. Preserve the original value and note any per-video save setting in the installed version. If the mismatch increases with time, report that pattern instead of chasing it with repeated offsets. This procedure is publisher-documented guidance, not a measured UK IPTV audio synchronisation result.