These were quite compact plants, 15 to 20" but probably are a variety of Aster. The right time of year and flower. The ones we have are a lot taller and do spread quickly.
Farmyard Nurseries is/was a lovely place to visit if ever you're down in West Wales. They used to have a plant stall in Carmarthen Market which was always very tempting!!
The Moneyless Chicken says:- Use it up, wear it out, make it do or do without.