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I was kind of hinting at that. In fairness it's a big enough subject to cause me problems and I've passed Installation and Testing and Part P. I was under the impression that the shielding could function as an earth as long as it's within the correct number for the breaker although I've never done it.
The op had been asking about garden lights so they could be wired direct to a circuit in the house couldn't they?
Airhead
Small core armoured cable can't rely on the steel armour to provide an earth return. It still needs a separate CPC for Ze.
The armour is just for physical protection. Then there is now a lot of issues about external earthing that relies on the main house earth.