Disconnecting battery for a holiday?

I'm going away for three weeks and I've read that disconnecting the battery on my TF is sensible to stop it draining whilst I'm away.



However, I've also read about disconnecting the horn and needing radio codes? I don't know about either of these things - I've got a new radio to get fitted when I'm back, so does it matter if I don't have a code for the old one?

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