By Cammomile
west sussex,
United Kingdom 
Updated photo for Seaburngirl
29 May, 2020
Answers
Thanks for trying. I've got a similar one in my garden but mine looks plumper. I've told her to wait and see what the flower is like and maybe I can identify it from that.
30 May, 2020
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Well it is a sedum but I have no idea which one. Sorry Cammomile.
29 May, 2020