Sorry picture isn't brilliant
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I don't think it is possible from the photo to say whether this is P. multiflorum, the native plant or the garden escape P. hybridum.
I clicked the "certain as I can be" box, or I thought I did. To be clear, I am in no doubt about this identification.
Cicuta obviously had his suspicions before I came along, but after my first thought was also that it is P. x hybridum but I couldn't prove it, I realised it CAN be proved!
Lat/Lng: 51.0931, -0.07631
OS grid ref: TQ348344