Puzzling plant - identified as Lepidium (Swine Cress)

Puzzling plant - identified as Lepidium (Swine Cress)

Observation - Puzzling plant - identified as Lepidium (Swine Cress) - UK and Ireland. Description: This plant was growing flat to the ground on the footpath through an arable field (very dry at the t

This plant was growing flat to the ground on the footpath through an arable field (very dry at the time - you can see the cracks). At first glance the leaves reminded me of buckshorn plantain, but I really don't think it can be that (wrong habitat and location). So perhaps it's a chamomile of some kind? It's just that the leaves don't look finely divided enough, but I can't think of anything else.
.
Title changed following identification by John Bratton and confirmation from Jo P - thank you!