http://www.footballgroundguide.com/derby_county/ Try this link fella, im driving down tomorrow and thats the only info iv found with regards to parking so far.
taken from fanzone There is no match day parking in the area of the stadium. Away fans are 'encouraged' to park in the 600-space supervised car park at Wilmorton College, on the A6 going into Derby from the south. With the new link road now open away supporters no longer walk along the river path. its just a 10 min walk down the link road, although on a sunny day, this is still an option. When we visited, got out of the stadium fairly quickly after the final whistle, walked steadily back to the car park and got out with no problems. Must be one of the best exits from a football ground ever, but it could be different if it took longer to get out of the stadium. You could try the car-park further along the same road, though it's officially for home fans. There is also a Park & Ride with 200 spaces on Megaloughton Lane. There is some free parking on the road outside the college and in a small industrial estate opposite, and there is also plenty of parking near the railway station which is a 20 min walk
Haha, its all sorted for today mate so no can do unfortunately! I was thinking of going to Watford with the Penistone Reds.