In article , andrewpreece
writes
Much research leads me to the conclusion that the mystery weed is
a member of the Asteraceae(=compositae) family, that is, Hawkweed (Hieracium
Anglicum???? ).

There's an orange flowered hawkweed which is thought to be a garden
escape. It seems to sit around for quite a long while (at least a couple
of years) before flowering. It's quite good at suddenly appearing in a
garden in fair abundance.
--
Kay Easton

Edward's earthworm page:
http://www.scarboro.demon.co.uk/edward/index.htm