Late flowering umbellifer for ID

Late flowering umbellifer for ID

Observation - Late flowering umbellifer for ID - UK and Ireland. Description: This one has beaten me. Was surprised to see this in flower in mid-September and took photographs to ID later - a month on and ... nothing seems to fit all the features noted.

This one has beaten me. Was surprised to see this in flower in mid-September and took photographs "to ID later" - a month on and ... nothing seems to fit all the features noted.