The message
from Janet Tweedy contains these words:

In article , Rupert
writes

Sounds like you got one of the rampageous sorts--wild garlic perhaps.
The larger ones are fairly well behaved and spectacular in a sort of "in
your face" manner.



No, not wild garlic, definitely alliums but not sure which ones !
--


Could also possibly be Ipheion which are allium related and have the
characteristic smell. They have strappy leaves which tend to lie rather
on the soil surface. Can spread a bit but on the other hand I'm having
trouble getting them established at all.
Janet G