What is the line between legal and illegal sex dolls in the UK?

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What is the line between legal and illegal sex dolls in the UK? Is it based on a certain height, or certain features specifically?
It’s generally based on who’s checking your package. UK border force isn’t the sharpest tool in the shed, so they may consider your 150cm doll to be too short even if it is fine. I’d go through a vendor who can sort out customs and not go any shorter than 140cm.