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Sounds like you need to check for a short to earth which could be e.g. a live wire in contact with the car body.
Next possibility is you have inadvertently killed the battery and will need to replace it.
ChasnotRobert-
Yeah, I wondered about that - I've only really plugged plasticky connectors into each other so I'd hope nothing was loose/free enough to be shorting. TBH the car is due some attention so if a new battery is the answer that wouldn't be the end of the world at all. Presumably having roadside assistance, getting them out is the best way to find out what's happened?
owl
An appeal to the more mechanically minded amongst you. I bought a mk6 golf a few months ago, been a dream since, not skipped a beat. Is due in for a service to pick up some bits I knew about when buying before some long trips coming up and MOT in Dec. I finally got around this weekend to replacing a wing mirror which had been battered about and fitting an after market android head unit (aliexpress). All seemed to go pretty well, but in hindsight I guess I may have had the head unit on for ~10 minutes without the engine being on and when I went to start the car it wasn't even close to turning over and the dash was list up with warning lights. So, assume I drained the battery (looking into it, seems lots of chat about these head units being problematic in this regard, recommendation being you need to go into settings and ensure it only ever turns on when engine on and auto-turns-off when engine off) but a mate came round to give me a jump, and despite 20 minutes of charge, nothing doing there. My questions are basically a) what should I do here? Use roadside breakdown cover to come and have a look or find local garage who offer some sort of outcall diagnosis/battery charge? b) my concern is that something I messed about with (wiring the wing mirror or the head unit) has gone wrong and emptied the battery which I will somehow need to get diagnosed, does this sound likely? And if so, is this something a general mechanic would take on or would I need a specialist electronics/audio guy?
Cheers