Anyone know what type of plant this is?

Hi Guys!

Well this is my first post and I just wondered if anyone knows what type of plant this is?
It's been growing in my garden for about 2 months now in a sunny part of my garden. Despite consulting my gardening books I just don't know what it is any help appreciated !

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That is one of the weed Euphorbias. Let it seed and you have got it forever. Take care when removing it, the sap is an irritant and can cause real problems if you touch say your eyes with any of the sap on your fingers.

 

Its Caper Spurge, Euphorbia lathyrus

Whether it's a weed or not is a matter of opinion, I find it interesting enough to leave in odd corners
Yes it does self seed but is easily hoed up at an early stage