1 Answer
It is Euphorbia lathyris, common name Caper Spurge. These pop up quite readily, usually from bird dropped seeds, and they are quite prolifically reproductive. Classed as a weed, and where there's one this year, there'll be several next year. If you remove it, wear gloves - the sap from this plant is a skin irritant.
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Thank you bamboo. IO really appreciate the ID plus removal advice. Will follow.– SimonCommented May 21, 2017 at 12:42