One site was a car-park in central Midsomer Norton where just a handful of teasels were to be found - the larvae were present in 10 of 12 teasel-heads collected. This seems not unusual for the species. For some reason it seems to eschew the largest and most prominent teasel-heads yet is present in much smaller ones.
The moth seems to have a high dispersal ability, remarkable considering its size. This would be very much advantageous for it as it depends on a biennial foodplant of disturbed ground, and cannot necessarily rely on foodplant being available on a single site for very many years.