Botanical name: Anthemis cotula
Family name: Asteraceae
The finely divided leaves of stinking mayweed can allow it to be confused with a number of other weed species. It has the typical white and yellow "daisy-like" flowers of many Asteraceae weeds. As suggested by their respective names, stinking mayweed has a very strong smell when crushed, unlike scentless chamomile, and the flowers are slightly larger in scentless chamomile and the leaflets slightly finer. (Massey Uni Weeds Database).
I was interested in drawing this plant's fine feathery leaves but noted it did have a subtle stink once I'd pulled it out of the ground - I really hoped it wasn't because it had been sprayed by a cat! Once identified all became clear.