Thank you to Richard T for the following:
Derbyshire County Council says on its website that its salt supplier was unable to deliver the required amounts in the recent deep freeze.
A message on its website said:
“We’re dealing with the worst winter weather for 30 years.
“We’re continuing to grit main routes across Derbyshire but extremely low temperatures mean salt and grit doesn’t work as effectively as usual.
“We’ve used 15,000 tonnes of salt so far this winter. We haven’t reduced the amount of grit and salt we’ve been spreading on the roads and we’re continuing to grit main routes as normal.
“After treating main routes we would usually start gritting side roads, but recent conditions have been so bad that we’ve needed to return to the main routes, which means side roads are not currently being treated.
“Our salt supplier hasn’t been able to deliver the required amounts and we’re monitoring the situation closely.
“We had a delivery last night and we’re doing all we can to get more supplies from elsewhere.
“We’ll start to fill up grit bins again (which are provided for use in public areas only) as soon as we can when supplies allow.”
Their general gritting policy can be also seen on their website by clicking here.
PARWICH.ORG 
hi i appreciate what as been said about the roads but we have not had a gritter around the village i live a morton for days i went to chesterfield the othr day trying to get to work and had to come home as the a61 has been really bad it should not be like that as it is classed as a main emergency road and has been bad all week it has not been treated enough a all.