Olive tree

When is it okay to move my olive tree from a container and replan in the garden? I live in south east England, London. Not that many frosts, as I hav a walled garden, south west facing.
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When is it okay to move my olive tree from a container and replan in the garden? I live in south east England, London. Not that many frosts, as I hav a walled garden, south west facing.