Don't know about the 156 but the 159 is a dealer only job with old keys not being reprogrammable, until recently. There's a guy in Scotland who's found a way around them, he's also done the Halo light kit for the 159 for me so maybe he can help? Trouble is, for the 159, he needs all the keys, key reader and body computer to do it.
Worth a try though? Facebook Project Halo UK, Samir Sarwar is the bloke you're looking for.
Guy
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