Picture of A515 at Parsley Hay from Sunday night on my facebook, A515 was 6 foot in snow. The person who took the picture had come through (to Belper) on a JCB digging their way through, and it took them two hours of digging to get through (I guess they really wanted to get back home!). From the picture it looked surprising they’d got through with a JCB even, snow up to the top of the drystone walls at the side of the road. So unless it’s been ploughed a whole lot since then, then you’re screwed.
I would go South then West then North, stick to very main roads, and only ones that aren’t marked as closed on the site below. A6 looks fine here in Belper and I saw a plough on the A517 this morning, so I’m guessing that has been cleared to Ashbourne.
http://www.bbc.co.uk/travelnews/derby