Wild Parsnip or Greater Burnet Saxifrage?

Wild Parsnip or Greater Burnet Saxifrage?

Observation - Wild Parsnip or Greater Burnet Saxifrage? - UK and Ireland. Description: This is growing in my garden. I have been desperate to identify it but have failed at every turn to make a certain identification. Leaves are hairless but sharply toothed, main stem is round with no ridges main stem not hollow root is creamy white

This is growing in my garden. I have been desperate to identify it but have failed at every turn to make a certain identification.

Leaves are hairless but sharply toothed,
main stem is round with no ridges
main stem not hollow
root is creamy white like parsnip but smaller.