@FailForward Thanks. I avoid google products as much as possible, and I've had already so many correct ids from you people here I can wait :)
@szescstopni Viburnum opulus, I think.
https://pl.wikipedia.org/wiki/Kalina_koralowa
There is one young plant in Leam Valley LNR, probably bird-sown.
@LeamValley Thanks. People here are great!
@szescstopni Try to feed it to Google Lens either via phone, or like this https://lens.google.com/search?p=Acn1BYcRMG52HAYaywC8pE_Cq3R1FnB1aFboCPuqJJlPlfOQaus3Hrp_w57zkt5wHLMR_0rA7iM4EedkDM3TbQEXkLJfGovIk1VRAVTWYeMKId5-2BfBv8gaulSJSzZNJc5p6sCrvGwZazciI0D9EZI15qrLWJyyQHqJCCP96qr5gTxIWxFMZAKm9hFl7utfAj49iiOcokLE_pd12UHG-RtKMZZYE55kbG77ySBa99ySxC5PfY3yctNhXjbWBgGPfiKrI1OvxxtBmJpCWCJXP73XUxSUbJzAPqVOdwy8Ey8E&ep=ccm&st=1688939970001&plm=Cg8IFRILCMPbrKUGEIiXlwgKDwgWEgsIw9uspQYQuOyfCAoPCBMSCwjD26ylBhDAk6AIChAIFBIMCMPbrKUGEOj%2B9aQDChAIGRIMCMPbrKUGEJjR/6QDChAIGhIMCMPbrKUGELjSiaUD#lns=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLG51bGwsIkVrY0tKRGd5TVRSaVl6YzVMVE0wTjJNdE5ETXpaQzFoTVdSbUxUUmtaamRrWVdNd1l6VmhZeElmV1RkU1RIVmFUbHBNUlc5aFVVUjFWV2RKVkUxaWJEVkJWbkZmUzJ0NFp3PT0iLG51bGwsbnVsbCxudWxsLDEsbnVsbCxbbnVsbCxudWxsLFszMjkxNSwyOTQyMCw3MDU4MCw1MjU0Ml0sbnVsbCw1XV0=
It seems Mapleleaf viburnum, or some kind of a fig-tree could be a candidate.