Taken from Lewisham Council's website (I googled Lewisham gritting)

It appears that, after roadways, places like main routes to schools have been prioritised. Quote:

"If, during cold weather, your road has not been salted it means it has not been identified as a priority route.
If you are concerned that a road or footpath is dangerous due to the presence of ice or snow, please contact us using the details below or use the online street fault reporting form" [this is a live link on the site].
"We will try to grit these additional areas as soon as is practical but please understand that there may be many areas requiring treatment and our staff will prioritise all calls."

There was some road gritting on Hengrave Road before the snow and there was gritting on pavements near HOP station yesterday evening.