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I have never seen a poppy with spiny leaves. Perhaps it is a lush Sonchus asper? Or an Acanthus?
although it looks frustratingly familiar.1st impression was Poppy.Aaaargh :( Hope someone can crack this.
Just been into my garden - my P. orientale does have 'spines'! Also, Hessayon talks of the 'bristly, deeply cut leaves'. I'm not sure if this is helpful to you ... Good luck with an ID!
I'm happy with Oriental Poppy if it has "spines".
Lat/Lng: 53.0381, -1.4688
OS grid ref: SK357491