Glass used as grit is still laying on the street

Earlier this month a local resident alerted me to the fact that the Council was using small pieces of glass as grit when the snow fell.  I raised this and it went in many of the local papers where residents from across the borough outlined why they thought it was a stupid idea, including it will stick to your shoes and scratch wooden floors, kids will make snowballs with it in and it will puncture bike tyres.  One of the other problems is that it isn't being cleaned up and on Saturday I found some of this laying on the pavement and in the roads around Blackheath Westcombe ward - I wonder how much of it is left across the borough?