Type III-L bursts are a sub-class of type III solar radio bursts that
tend to occur after the impulsive phase of flares; are longer in
duration than individual type IIIs and tend to be low-frequency.
There has been a proposal that type III-Ls are connected to solar
energetic proton (SEP) events. Most work on this connection has
started from samples of SEP events, but if type III-Ls are to be
useful for prediction of SEP events, then we need to understand the
properties of samples of type III-L bursts. This talk reports
preliminary results from such a study. An operating definition based
on previous work is used to identify type III-L events amongst M- and
X-class flares from 2001; and then correlations with other properties
of these events are investigated, including association with SEP
events. If there is a correlation with SEP events, one important
factor that these bursts allow us to address is the question of
whether acceleration takes place at an associated CME, or closer to
the flare site well below the CME.